[fix]优化账号多登弹窗逻辑

lib/dialog/account_replace_dialog.dart

@@ -16,6 +16,7 @@ class AccountReplaceDialog {
 
   static void show() {
     SmartDialog.show(
+        backDismiss: false,
         builder: (_) => _AccountReplaceView(),
         tag: _tag,
         clickMaskDismiss: false);
@@ -51,7 +52,7 @@ class _AccountReplaceView extends StatelessWidget {
               top: 16.w,
               right: 16.w,
               child: GestureDetector(
-                onTap: onCloseClick,
+                onTap: onKnowClick,
                 child: Assets.images.iconDialogClose2
                     .image(width: 20.w, height: 20.w),
               )),
@@ -101,9 +102,6 @@ class _AccountReplaceView extends StatelessWidget {
     );
   }
 
-  void onCloseClick() {
-    AccountReplaceDialog.dismiss();
-  }
 
   void onKnowClick() {
     //清空至首页