Remove duplicate whitespace validation in buildtable.pl

[maradini77]

Summary

Removes duplicate validation logic for leading whitespace in field values in scripts/buildtable.pl.

Changes

• Removed redundant $val =~ /^\s/ check inside the field parsing branch
• Kept the unified validation after branching logic
• Maintains identical error detection behavior

Rationale

The same whitespace validation was performed twice:

1. Inside the first parsing branch
2. After the branching logic

[jonatack]

@maradini77 Thank you for your proposal. While this check line 149 is indeed a subset of the cases checked by line 158 further down, keeping it may ease debugging a failure. If removed, all leading whitespace errors in values would return "Extra spaces," making it harder to quickly see on a batch of files whether the issue is in a new field intro or a continuation line. So let's leave it as-is.