changing OSX instructions in INSTALL.md to reflect how everything works

main.c

@@ -282,7 +282,7 @@ void prepare_window(WINDOW* w) {
 
 int main(int argc, char* argv[]) {
   int ch;
-  ToxWindow* a;
+  ToxWindow* current_window;
 
   init_term();
   init_tox();
@@ -294,22 +294,20 @@ int main(int argc, char* argv[]) {
     do_tox();
 
     // Draw.
-    a = &windows[w_active];
-    prepare_window(a->window);
-    a->blink = false;
-    a->onDraw(a);
+    current_window = &windows[w_active];
+    prepare_window(current_window->window);
+    current_window->blink = false;
+    current_window->onDraw(current_window);
     draw_bar();
 
     // Handle input.
     ch = getch();
     if(ch == '\t') {
       w_active = (w_active + 1) % w_num;
-    }
-    else if(ch == KEY_BTAB) {
+    } else if(ch == KEY_BTAB) {
       w_active = (w_active + w_num - 1) % w_num;
-    }
-    else if(ch != ERR) {
-      a->onKey(a, ch);
+    } else if(ch != ERR) {
+      current_window->onKey(current_window, ch);
     }
 
   }