MOBILE-2829 mac: Use inappbrowser for SSO in Mac

desktop/assets/mac/parent.plist

@@ -16,7 +16,5 @@
     <true/>
     <key>com.apple.security.device.audio-input</key>
     <true/>
-    <key>LSMultipleInstancesProhibited</key>
-    <true/>
   </dict>
 </plist>

src/core/login/providers/helper.ts

@@ -561,8 +561,8 @@ export class CoreLoginHelperProvider {
      * @return {boolean} True if embedded browser, false othwerise.
      */
     isSSOEmbeddedBrowser(code: number): boolean {
-        if (this.appProvider.isLinux()) {
-            // In Linux desktop apps, always use embedded browser.
+        if (this.appProvider.isLinux() || this.appProvider.isMac()) {
+            // In Linux and Mac desktop apps, always use embedded browser.
             return true;
         }