Fix redundant double negation errors

src/components/alphanumericshortcuts/alphanumericshortcuts.js

@@ -10,7 +10,7 @@ define(['dom', 'focusManager'], function (dom, focusManager) {
         if (e.ctrlKey) {
             return;
         }
-        if (!!e.shiftKey) {
+        if (e.shiftKey) {
             return;
         }
         if (e.altKey) {

src/components/apphost.js

@@ -324,7 +324,7 @@ define(["appSettings", "browser", "events", "htmlMediaHelper"], function (appSet
       * Ask user for exit
       */
     function askForExit() {
-        if (!!exitPromise) {
+        if (exitPromise) {
             return;
         }
 

src/scripts/browserdeviceprofile.js

@@ -92,7 +92,7 @@ define(['browser'], function (browser) {
             return true;
         }
 
-        if (!!videoTestElement.canPlayType) {
+        if (videoTestElement.canPlayType) {
             return videoTestElement.canPlayType('application/x-mpegurl; codecs="avc1.42E01E, ac-3"').replace(/no/, '') ||
                 videoTestElement.canPlayType('application/vnd.apple.mpegURL; codecs="avc1.42E01E, ac-3"').replace(/no/, '');
         }