Change english to en in the client run configuration

This is consistent with the Gradle file.

Signed-off-by: Graham <gpe@openrs2.org>

.idea/runConfigurations/client.xml

@@ -2,7 +2,7 @@
   <configuration default="false" name="client" type="Application" factoryName="Application" nameIsGenerated="true">
     <option name="MAIN_CLASS_NAME" value="client" />
     <module name="openrs2.nonfree.client.main" />
-    <option name="PROGRAM_PARAMETERS" value="1 live english game0" />
+    <option name="PROGRAM_PARAMETERS" value="1 live en game0" />
     <method v="2">
       <option name="Make" enabled="true" />
     </method>