Corrected event target from document to window on Windows

Author: alexangas

src/windows/KeyboardProxy.js

@@ -5,7 +5,7 @@ var inputPane = Windows.UI.ViewManagement.InputPane.getForCurrentView();
 var keyboardScrollDisabled = false;
 
 inputPane.addEventListener('hiding', function() {
-    cordova.fireDocumentEvent('native.keyboardhide');
+    cordova.fireWindowEvent('native.keyboardhide');
     cordova.plugins.Keyboard.isVisible = false;
 });
 
@@ -14,7 +14,7 @@ inputPane.addEventListener('showing', function(e) {
         // this disables automatic scrolling of view contents to show focused control
         e.ensuredFocusedElementInView = true;
     }
-    cordova.fireDocumentEvent('native.keyboardshow', { keyboardHeight: e.occludedRect.height });
+    cordova.fireWindowEvent('native.keyboardshow', { keyboardHeight: e.occludedRect.height });
     cordova.plugins.Keyboard.isVisible = true;
 });