fix(device-change): enable on iOS Safari < 15.4

JitsiMediaDevices.js

     isMultipleAudioInputSupported() {
         return !(
             (browser.isFirefox() && browser.isVersionLessThan('101'))
-            || (browser.isIosBrowser() && browser.isVersionLessThan('15.4'))
+            || browser.isIosBrowser()
         );
     }
 

modules/RTC/RTCUtils.js

             return isAudioOutputDeviceChangeAvailable;
         }
 
-        // Calling getUserMedia again (for preview) kills the track returned by the first getUserMedia call because of
-        // https://bugs.webkit.org/show_bug.cgi?id=179363. Therefore, do not show microphone/camera options on mobile
-        // Safari. Bug fixed in Safari 15.4.
-        if ((deviceType === 'audioinput' || deviceType === 'input')
-            && browser.isIosBrowser()
-            && browser.isVersionLessThan('15.4')) {
-            return false;
-        }
-
         return true;
     }