fmt: formatting interfaces does not pad between field name and type

[islonely]

Describe the bug

v fmt <file> does not pad the space between the interface field name and field type with spaces to align the types on the same column like it does with structs.

Reproduction Steps

v fmt <file> on this code:

interface Hex {
        a int
        ab int
        abc int
        abcd int
        abcde int
}

Expected Behavior

output:

interface Hex {
	a      int
	ab     int
	abc    int
	abcd   int
	abcde  int
	abcdef int
}

Current Behavior

output:

interface Hex {
        a int
        ab int
        abc int
        abcd int
        abcde int
}

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.2 37e5616

Environment details (OS name and version, etc.)

V full version: V 0.4.2 37e5616
OS: windows, Microsoft Windows 11 Pro v22621 64-bit
Processor: 16 cpus, 64bit, little endian, 

getwd: C:\Users\imado\Documents\cyberian_tiger
vexe: C:\Users\imado\v\v.exe
vexe mtime: 2023-10-09 22:29:31

vroot: OK, value: C:\Users\imado\v
VMODULES: OK, value: C:\Users\imado\.vmodules
VTMP: OK, value: C:\Users\imado\AppData\Local\Temp\v_0

Git version: git version 2.33.1.windows.1
Git vroot status: weekly.2023.40.1-50-g37e5616b
.git/config present: true

CC version: Error: 'cc' is not recognized as an internal or external command,
operable program or batch file.

thirdparty/tcc status: thirdparty-windows-amd64 e90c2620

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