Fixed compilation errors

[GCodergr]

Fixed compilation errors for win32/game_of_life example.

Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example follows the core naming convention: https://github.com/odin-lang/Odin/wiki/Naming-Convention (exception can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's BSD-3 license. Only for third-party dependencies are other licenses allowed.

[karl-zylinski]

Thank you. Because of the new string16 stuff, you can actually remove that L procedure and use the string constant / literal straight up: class_name := L("OdinMainClass") -> just do CLASS_NAME :: "OdinMainClass".

You can put the CLASS_NAME as a global constant since its used in few places.

Essentially any place where L is used, you can use the constant straight into the win32 procs.