Revert "Fix: make the isSafari env include both iOS and macOS (#3215)"

This reverts commit a5b653f.

Author: JiuqingSong

packages/roosterjs-content-model-core/lib/editor/core/createEditorCore.ts

@@ -75,7 +75,7 @@ function createEditorEnvironment(
         isAndroid: /android/i.test(userAgent),
         isIOS: /iPad|iPhone/.test(userAgent),
         isSafari:
-            userAgent.indexOf('AppleWebKit') >= 0 &&
+            userAgent.indexOf('Safari') >= 0 &&
             userAgent.indexOf('Chrome') < 0 &&
             userAgent.indexOf('Android') < 0,
         isMobileOrTablet: getIsMobileOrTablet(userAgent),