Replace overrides with override in a contract (#26)

`overrides` used to be `override` in earlier Tact versions

Author: mhbdev

src/routes/(examples)/05-your-own-trait/contract.tact

@@ -67,12 +67,12 @@ contract Counter with Deployable, Trackable {
     }
 
     // the trait allows us to override the default filtering behavior
-    overrides fun filterMessage(): Bool {
+    override fun filterMessage(): Bool {
         // our contract's custom filtering behavior is to remove all filters and count all messages
         return true;
     }
 
     // receive("reset stats") is added automatically to allow owner to reset the stats
     // get fun stats(): Int is added automatically to query the stats
     // get fun owner(): Address is added automatically to query who the owner is
-}
+}