mvn: enable completion for mvnw

plugins/mvn/mvn.plugin.zsh

@@ -287,7 +287,7 @@ function listMavenCompletions {
     ); 
 }
 
-compctl -K listMavenCompletions mvn
+compctl -K listMavenCompletions mvn mvnw
 compctl -K listMavenCompletions mvn-color
 compctl -K listMavenCompletions mvn-or-mvnw