Clear new flag when creating image pins.

Otherwise if you then move it we'll think it needs to be inserted
and end up with a circular drawings list.

Fixes https://gitlab.com/kicad/code/kicad/issues/4622

eeschema/tools/lib_pin_tool.cpp

@@ -281,6 +281,7 @@ void LIB_PIN_TOOL::CreateImagePins( LIB_PIN* aPin )
 
         newPin->SetUnit( ii );
         aPin->GetParent()->AddDrawItem( newPin );
+        newPin->ClearFlags( IS_NEW );
     }
 }