Refactor git hash preview script to show only the first matching hash (…

…#286)

helpers/PsFzfGitHashes-Preview.sh

@@ -5,5 +5,5 @@ hash=$1
 
 pushd . > /dev/null
 cd "$dir"
-echo $hash | grep -o "[a-f0-9]\{7,\}" | xargs git show $args
+echo $hash | grep -o "[a-f0-9]\{7,\}"  -m 1  | head -1 | xargs git show $args
 popd > /dev/null