allow the font awesome size define to be overriden

rlImGui.h

@@ -56,8 +56,10 @@
 
 #ifndef NO_FONT_AWESOME
 #include "extras/IconsFontAwesome6.h"
+#ifndef FONT_AWESOME_ICON_SIZE
 #define FONT_AWESOME_ICON_SIZE 11
 #endif
+#endif
 
 #ifdef __cplusplus
 extern "C" {