scope: ensure texture is updated from channel count too

Fixes #1610

app/render/videoparams.cpp

@@ -163,7 +163,8 @@ bool VideoParams::operator==(const VideoParams &rhs) const
       && time_base() == rhs.time_base()
       && format() == rhs.format()
       && pixel_aspect_ratio() == rhs.pixel_aspect_ratio()
-      && divider() == rhs.divider();
+      && divider() == rhs.divider()
+      && channel_count() == rhs.channel_count();
 }
 
 bool VideoParams::operator!=(const VideoParams &rhs) const

app/widget/scope/scopebase/scopebase.cpp

@@ -67,10 +67,7 @@ void ScopeBase::UploadTextureFromBuffer()
   if (buffer_) {
     makeCurrent();
 
-    if (!texture_
-        || texture_->width() != buffer_->width()
-        || texture_->height() != buffer_->height()
-        || texture_->format() != buffer_->format()) {
+    if (!texture_ || texture_->params() != buffer_->video_params()) {
       texture_ = nullptr;
       managed_tex_ = nullptr;