pantheon.updateScript: always use github api

Unfortunately elementary has suddenly decided to add ${version}-debian
tags into the mix which ls-remote will always sort last. I believe these tags
point to the deb-packaging branches in the repo's which we certainly
don't ever want to use as they contain no source.

pkgs/desktops/pantheon/update.sh

@@ -114,13 +114,7 @@ EOF
     function get_latest_tag ( ) {
         repo_name="$1"
 
-        # Using github release api because sorting this repo just doesn't work because of old git sillyness
-        # Also too lazy to care to adapt `git ls-remote` command to work with it
-        if [ $repo_name == "switchboard-plug-pantheon-shell" ]; then
-            curl --silent --show-error --fail -X GET "https://api.github.com/repos/elementary/$repo_name/releases/latest" | jq -r '.tag_name'
-        else
-            git ls-remote --tags --sort="v:refname" "https://github.com/elementary/$repo_name" | tail -n1 | sed 's/.*\///; s/\^{}//'
-        fi
+        curl --silent --show-error --fail -X GET "https://api.github.com/repos/elementary/$repo_name/releases/latest" | jq -r '.tag_name'
     }
 
 #