gdi32: Indentation fix

[Andrew Talbot]

Dmitry Timoshkov wrote:

> Andrew Talbot <andrew.talbot at talbotville.com> wrote:
> 
>> Changelog:
>>     gdi32: Indentation fix.
> 
> Please keep 4 spaces indentation without tabs.
> 

Thus far, I have fixed the bits of code that are misleadingly indented using
the same indentation regime as the surrounding code, primarily to make it as
clear as I can precisely which lines were wrong in the first place. Should I
be reformatting the whole of each function I fix to bring it in line with
the 4-space standard, instead?