git:https-and-ssh: Fix ssh -> https

Apparently there was an issue with the conversion from ssh to https
which I never noticed? The script would replace the colon of the
`https://` and not the one after the domain:

    https///github.com:[...]

I rewrote both cases in a simpler way while fixing the issue.

.config/zsh/autoload/git/git-https-and-ssh

@@ -9,12 +9,12 @@ remote="${1:-origin}"
 url="$($GIT remote get-url "$remote")"
 
 if [ "${url##https://}" = "$url" ]; then
-	https_url="https://${url##*@}"
-	https_url="${https_url%%:*}/${https_url#*:}"
+	https_url="${url##*@}"
+	https_url="https://${https_url/:/\/}"
 	$GIT remote set-url "$remote" "$https_url"
 	$GIT remote set-url --push "$remote" "$url"
 else
-	ssh_url="git@${url#https://}"
-	ssh_url="${ssh_url%%/*}:${ssh_url#*/}"
+	ssh_url="${url#https://}"
+	ssh_url="git@${ssh_url/\//:}"
 	$GIT remote set-url --push "$remote" "$ssh_url"
 fi