Clean up lighthouse plugin

plugins/lighthouse/lighthouse.plugin.zsh

-# To use: add a .lighthouse file into your directory with the URL to the
-# individual project. For example:
-# https://rails.lighthouseapp.com/projects/8994
-# Example usage: https://screencast.com/t/ZDgwNDUwNT
 open_lighthouse_ticket () {
   if [ ! -f .lighthouse-url ]; then
     echo "There is no .lighthouse-url file in the current directory..."
-    return 0;
-  else
-    lighthouse_url=$(cat .lighthouse-url);
-    echo "Opening ticket #$1";
-    open_command "$lighthouse_url/tickets/$1";
+    return 0
   fi
+
+  lighthouse_url=$(cat .lighthouse-url)
+  echo "Opening ticket #$1"
+  open_command "$lighthouse_url/tickets/$1"
 }
 
 alias lho='open_lighthouse_ticket'