Fix conditional in uninstall prompt

tools/uninstall.sh

@@ -1,5 +1,5 @@
 read -r -p "Are you sure you want to remove Oh My Zsh? [y/N] " confirmation
-if [ $confirmation = y ] && [ $confirmation = Y ]
+if [ $confirmation = y ] || [ $confirmation = Y ]
 then
   echo "Uninstall cancelled"
   exit