utils: fix sqf case util when code doesn't end with whitespace

[PabstMirror]

flush buffer if file ends on a char (no whitespace/newline)

e.g. https://github.com/BourbonWarfare/POTATO/blob/master/addons/bodyCleanup/functions/fnc_getPlayerViewCones.sqf#L48
it would delete the last _viewCones

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.2%. Comparing base (f43d44b) to head (4faf2b6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
bin/src/utils/sqf/case.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
bin/src/utils/sqf/case.rs	7.4% <0.0%> (-0.2%)	⬇️

[BrettMayson]

Ah shoot, good catch