feat: fix imageview function miss bug after closed

src/src/UI/Widget/ImageView/dicomimageview.cpp

@@ -118,6 +118,7 @@ void DicomImageView::initImageViewerFirstTime()
         mGLRenWin->GetInteractor()->RemoveAllObservers();
         mImageViewer->Delete();
         mImageViewer = nullptr;
+        mIsSlotInited = false;
     }
 }
 
@@ -145,6 +146,7 @@ void DicomImageView::resetView()
 
         mImageViewer->Delete();
         mImageViewer = nullptr;
+        mIsSlotInited = false;
         //don't delete series！！！ It's belong to data cache
         mSeries = nullptr;
     }