Revert "Extend HU_FONTSTART to STCFN022 (from 2.2)"

This reverts commit 64007290.

src/hu_stuff.h

@@ -21,7 +21,7 @@
 //------------------------------------
 //           heads up font
 //------------------------------------
-#define HU_FONTSTART '\x16' // the first font character
+#define HU_FONTSTART '\x1F' // the first font character
 #define HU_FONTEND '~'
 
 #define HU_FONTSIZE (HU_FONTEND - HU_FONTSTART + 1)