Defaults: set "release confirms", for transform tweak with single click and drag.

The old behavior with two clicks evolved out of a gesture system, and it can
have some advantages if you want to press more keys to constrain for example. But
this seems a better default.

source/blender/blenloader/intern/versioning_defaults.c

@@ -71,6 +71,9 @@ void BLO_update_defaults_userpref_blend(void)
 	U.flag &= ~USER_SCRIPT_AUTOEXEC_DISABLE;
 #endif
 
+	/* Transform tweak with single click and drag. */
+	U.flag |= USER_RELEASECONFIRM;
+
 	/* Ignore the theme saved in the blend file,
 	 * instead use the theme from 'userdef_default_theme.c' */
 	{