Remove arq as fallback for shy-latn

Having arq as fallback is problematic because shi is LTR and
arq is RTL. In any case, the translation to French
is more complete, so this wouldn't have a significant effect.

It does fix a current problem that wikis with shy as the content
language are shown right to left, which is definitely wrong.

This was requested by User:Reda Kerbouche, and it makes
sense to me.

Bug: T281085
Change-Id: I09769c5ad8512e3545f5de8129e58ab4daec779a

languages/messages/MessagesShy_latn.php

@@ -9,7 +9,7 @@
  * @author Reda Kerbouche
  */
 
-$fallback = 'fr, arq';
+$fallback = 'fr';
 
 $namespaceNames = [
 	NS_MEDIA            => 'Alɣagdud',