fix: unexpected type gnolang.BigdecValue

[anarcher]

Description

When I import math , adding realm to chain is OK but it raise a panic unexpected type gnolang.BigdecValue.

package hello

import "math"

func Hello() string {
        return ("Hello World!")
}

Adding is OK, but restarting chain or adding another realm raise a panic unexpected type gnolang.BigdecValue.

panic: unexpected type gnolang.BigdecValue [recovered]
        panic: gno.land/r/math1/hello.gno:1: unexpected type gnolang.BigdecValue

goroutine 1 [running]:
github.com/gnolang/gno/pkgs/gnolang.predefineNow.func1()
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/preprocess.go:2830 +0x250
panic({0x1017fd2e0, 0x140057be4f0})
        /Users/anarch/.gobrew/versions/1.18.9/go/src/runtime/panic.go:838 +0x204
github.com/gnolang/gno/pkgs/gnolang.fillTypesOfValue({0x10191dac0, 0x140001ba1b0}, {0x1019115e8?, 0x1400a8b6e10?})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/realm.go:1365 +0x668
github.com/gnolang/gno/pkgs/gnolang.fillTypesTV({0x10191dac0, 0x140001ba1b0}, 0x14002f8cfa8)
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/realm.go:1295 +0x78
github.com/gnolang/gno/pkgs/gnolang.fillTypesOfValue({0x10191dac0, 0x140001ba1b0}, {0x10190fd38?, 0x140046501e0?})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/realm.go:1357 +0x6bc
github.com/gnolang/gno/pkgs/gnolang.(*defaultStore).loadObjectSafe(0x140001ba1b0, {{{0x58, 0xa6, 0xd6, 0x80, 0x1a, 0xe7, 0x71, 0xe6, 0x32, ...}}, ...})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/store.go:289 +0x2fc
github.com/gnolang/gno/pkgs/gnolang.(*defaultStore).GetObjectSafe(0x140001ba1b0, {{{0x58, 0xa6, 0xd6, 0x80, 0x1a, 0xe7, 0x71, 0xe6, 0x32, ...}}, ...})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/store.go:258 +0x88
github.com/gnolang/gno/pkgs/gnolang.(*defaultStore).GetObject(0x1?, {{{0x58, 0xa6, 0xd6, 0x80, 0x1a, 0xe7, 0x71,
 0xe6, 0x32, ...}}, ...})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/store.go:244 +0x3c
github.com/gnolang/gno/pkgs/gnolang.(*PackageValue).GetBlock(0x14003e50960, {0x10191dac0?, 0x140001ba1b0?})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/values.go:828 +0x98
github.com/gnolang/gno/pkgs/gnolang.(*defaultStore).GetPackage(0x140001ba1b0, {0x14003a28c71, 0x4}, 0x38?)
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/store.go:129 +0x3cc
github.com/gnolang/gno/pkgs/gnolang.tryPredefine({0x10191dac0, 0x140001ba1b0}, {0x10191bca8, 0x140031d02c0}, {0x10191a560, 0x14006086b00?})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/preprocess.go:2943 +0xa80
github.com/gnolang/gno/pkgs/gnolang.predefineNow2({0x10191dac0, 0x140001ba1b0}, {0x10191bca8, 0x140031d02c0}, {0
x10191a560?, 0x14006086b00?}, 0x200?)
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/preprocess.go:2846 +0xec
github.com/gnolang/gno/pkgs/gnolang.predefineNow({0x10191dac0, 0x140001ba1b0}, {0x10191bca8, 0x140031d02c0}, {0x10191a560, 0x14006086b00})
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/preprocess.go:2835 +0xd4
github.com/gnolang/gno/pkgs/gnolang.PredefineFileSet({0x10191dac0, 0x140001ba1b0}, 0x140031d0580, 0x14008994f90)
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/preprocess.go:38 +0x630
github.com/gnolang/gno/pkgs/gnolang.(*Machine).PreprocessAllFilesAndSaveBlockNodes(0x1400022c240)
        /Users/anarch/go/blockchain/src/gno/pkgs/gnolang/machine.go:144 +0xe4
github.com/gnolang/gno/pkgs/sdk/vm.(*VMKeeper).Initialize(0x140001ba240, {0x101912e60, 0x14000232280})
        /Users/anarch/go/blockchain/src/gno/pkgs/sdk/vm/keeper.go:76 +0x1c0
github.com/gnolang/gno/gnoland.NewApp({0x101536a94?, 0x26?}, 0x10?, {0x101913fb8, 0x14000300620})
        /Users/anarch/go/blockchain/src/gno/gnoland/app.go:82 +0x6c8
main.runMain({0x14000032210, 0x0, 0x0})
        /Users/anarch/go/blockchain/src/gno/cmd/gnoland/main.go:77 +0x558
main.main()
        /Users/anarch/go/blockchain/src/gno/cmd/gnoland/main.go:28 +0x54

Please provide a detailed description of what was done in this PR

How has this been tested?

No yet.

Please complete this section if you ran tests for this functionality, otherwise delete it