feat(marked): remove unnecessary code

plugins/marked2/marked2.plugin.zsh

@@ -3,10 +3,5 @@
 # If marked is passed a file, open it in Marked
 #
 function marked() {
-    if [ "$1" ]
-    then
-        open -a "marked 2.app" "$1"
-    else
-        open -a "marked 2.app"
-    fi
+    open -a "marked 2.app" "$1"
 }