Fix white balance uninitialized at start

imagescrollareagl.cpp

@@ -103,6 +103,7 @@ void ImageWidget::setImage(std::shared_ptr<RawImage> image, int index)
     m_imgWidth = image->width();
     m_imgHeight = image->height();
     m_currentImg = index;
+    m_whiteBalance[0] = m_whiteBalance[1] = m_whiteBalance[2] = 1.0f;
 
     if(!m_image)return;