Cleanup: remove redundant temp dir init

This is already called by wm_init_userdef, in old code
different initialization methods were used but now it's not needed.

Confusing since prefs are loaded in this function that don't initialize temp.

source/blender/windowmanager/intern/wm_files.c

@@ -727,8 +727,6 @@ int wm_homefile_read(
 		if (BLI_listbase_is_empty(&wmbase)) {
 			wm_clear_default_size(C);
 		}
-		BKE_tempdir_init(U.tempdir);
-
 #ifdef WITH_PYTHON_SECURITY
 		/* use alternative setting for security nuts
 		 * otherwise we'd need to patch the binary blob - startup.blend.c */