Revert removal of fake editing for numeric input

Revert changes from 785159e6e4
but keep 'ifdef'.

@mont29 maintains this area and prefers to keep existing logic.
Note that there was misunderstanding that '*' was intended only
to be a backup key for '=' for keyboards which require holding a
modifier.

source/blender/editors/util/numinput.c

@@ -49,7 +49,7 @@
 #include "UI_interface.h"
 
 /* Numeric input which isn't allowing full numeric editing. */
-// #define USE_FAKE_EDIT
+#define USE_FAKE_EDIT
 
 /* NumInput.flag */
 enum {