cleanup: make test more readable

modules/RTC/RTCBrowserType.js

         // Temasys do not support Microsoft Edge:
         // http://support.temasys.com.sg/support/solutions/articles/
         // 5000654345-can-the-temasys-webrtc-plugin-be-used-with-microsoft-edge-
-        if (RTCBrowserType.isIExplorer()
-                && RTCBrowserType.getIExplorerVersion() < 12) {
-            return true;
-        }
-
-        return RTCBrowserType.isSafari();
+        return (
+            RTCBrowserType.isSafari()
+            || (RTCBrowserType.isIExplorer()
+                && RTCBrowserType.getIExplorerVersion() < 12)
+        );
     },
 
     /**