vcs: listen for kbd on emulator div

doc/notes.txt

@@ -166,6 +166,7 @@ TODO:
   - renaming main file doesn't change repo def.
   - can't edit or push files until successful compile
   - changing platform of repo makes one platform redirect to another platform
+    - should be able to change vcs -> vcs.mame for exmaple
 - keyboard shortcuts
   - ctrl+alt+l on ubuntu locks screen
   - alt-D doesn't work anymore

src/platform/vcs.ts

@@ -487,7 +487,8 @@ class VCSStellaPlatform implements Platform {
           scalingMode: this.Stellerator.ScalingMode.qis,
           tvEmulation: this.Stellerator.TvEmulation.composite,
           phosphorLevel: 0.5,
-          scanlineLevel: 0.2
+          scanlineLevel: 0.2,
+          keyboardTarget: this.mainElement
       }
     );
   }