canonicalize name of field

Author: myk002

df.ui.xml

@@ -815,7 +815,7 @@
         <int16_t name='min_y'/>
         <int16_t name='max_x'/>
         <int16_t name='max_y'/>
-        <compound type-name='coord' name='window_x'/>
+        <compound type-name='coord' name='corner'/>
         <pointer type-name='graphic_viewportst' name='main_viewport'/>
         <static-array name='lower_viewport' pointer-type='graphic_viewportst' count='8'/>
         <int32_t name='under_limit_start'/>