Untabify every single file

YOLO.

This is a repeat of #642. As before, I just did

    rg -l '\t' | xargs -n 1 sed -i -e 's/\t/    /g'

inside the desktop_version/ folder.

desktop_version/src/TowerBG.h

@@ -5,16 +5,16 @@
 
 struct TowerBG
 {
-	SDL_Surface* buffer;
-	SDL_Surface* buffer_lerp;
-	bool tdrawback;
-	int bypos;
-	int bscroll;
-	int colstate;
-	int scrolldir;
-	int r;
-	int g;
-	int b;
+    SDL_Surface* buffer;
+    SDL_Surface* buffer_lerp;
+    bool tdrawback;
+    int bypos;
+    int bscroll;
+    int colstate;
+    int scrolldir;
+    int r;
+    int g;
+    int b;
 };
 
 #endif /* TOWERBG_H */