Renaming slightly damaged anvil in anvil panics

[AndreasHGK]

panic: should never happen [recovered]
        panic: should never happen

goroutine 33 [running]:
github.com/df-mc/dragonfly/server/session.(*Session).handlePackets.func1()
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/session.go:306 +0x74
panic({0xa62ae0, 0xf10360})
        C:/Program Files/Go/src/runtime/panic.go:838 +0x207
github.com/df-mc/dragonfly/server/item.DisplayName({0xf12b20, 0xc000c7fe20}, {0x0?, 0x0?, {0x0?, 0x0?}})
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/item/item.go:212 +0xb9
github.com/df-mc/dragonfly/server/session.(*ItemStackRequestHandler).handleCraftRecipeOptional(0xc004c3dc50?, 0xc0058630f8, 0xc0000001e0, {0xc00585b570, 0x1, 0x17?})
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/handler_anvil.go:97 +0x132a
github.com/df-mc/dragonfly/server/session.(*ItemStackRequestHandler).handleRequest(0xc0010ea640, {0xffffffe9, {0xc0058a1440, 0x3, 0x3}, {0xc00585b570, 0x1, 0x1}}, 0xc0000001e0)
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/handler_item_stack_request.go:106 +0x89d
github.com/df-mc/dragonfly/server/session.(*ItemStackRequestHandler).Handle(0xc0010ea640, {0xf19258?, 0xc004d878a8}, 0xc0000001e0)
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/handler_item_stack_request.go:51 +0x1fe
github.com/df-mc/dragonfly/server/session.(*Session).handlePacket(0xc0000001e0, {0xf19258, 0xc004d878a8})
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/session.go:422 +0x9b
github.com/df-mc/dragonfly/server/session.(*Session).handlePackets(0xc0000001e0)
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/session.go:315 +0xef
created by github.com/df-mc/dragonfly/server/session.(*Session).Start
        C:/Users/andre/go/pkg/mod/github.com/df-mc/dragonfly@v0.7.6-0.20220731122825-867e8ad695dc/server/session/session.go:220 +0xa5
exit status 2