Fix mfpub syntax highlighting

buildroot/share/git/mfpub

@@ -24,14 +24,14 @@ if [[ $ORG != "MarlinFirmware" || $REPO != "MarlinDocumentation" ]]; then
   exit
 fi
 
-# Check out the named branch (or stay in current)
-git checkout $BRANCH
-
 if [[ $BRANCH == "gh-pages" ]]; then
   echo "Can't build from 'gh-pages.' Only the Jekyll branches (based on 'master')."
   exit
 fi
 
+# Check out the named branch (or stay in current)
+git checkout $BRANCH
+
 echo "Stashing any changes to files..."
 echo "Don't forget to update and push 'master'!"
 # GOJF Card
@@ -69,7 +69,7 @@ if [[ $BRANCH == "master" ]]; then
 
 else
 
-  if [ -z "$(git branch -vv | grep ^\* | grep \\[origin)" ]; then
+  if [ -z "$(git branch -vv | grep ^\* | grep \\\[origin)" ]; then
     firstpush
   else
     echo