fix whitespace lexing

[jprochazk]

hebi/src/internal/syntax/lexer.rs

Lines 270 to 275 in 83b633c

	#[doc(hidden)]
	#[regex(r"(\r?\n)+[ ]*", priority = 10)]
	_Tok_Indent,
	#[doc(hidden)]
	#[regex(r"[ \n\r]+")]
	_Tok_Whitespace,

you can see that if a newline is prefixed by a space character, it will become the _Tok_Whitespace token instead of _Tok_Indentation, and _Tok_Whitespace is discarded:

hebi/src/internal/syntax/lexer.rs

Line 87 in 83b633c

Ok(TokenKind::_Tok_Whitespace | TokenKind::_Tok_Comment) => continue,

i feel like it should Just Work ™️ if we remove _Tok_Whitespace and add space to the first character set in the _Tok_Indentation regex