UI: fsmenu_insert_entry Declaration Mismatch

Code cleanup. Fixes a mismatch between definition and declaration of fsmenu_insert_entry().

Differential Revision: https://developer.blender.org/D6712

Reviewed by Julian Eisel

source/blender/editors/space_file/fsmenu.h

@@ -42,7 +42,7 @@ void fsmenu_insert_entry(struct FSMenu *fsmenu,
                          enum FSMenuCategory category,
                          const char *path,
                          const char *name,
-                         const int icon,
+                         int icon,
                          const enum FSMenuInsert flag);
 
 /** Refresh 'valid' status of given menu entry */