UI: Add Heading to Curve Deform Toggles

Adds a heading to the three Properties Curve Deform toggles.

Differential Revision: https://developer.blender.org/D9766

Reviewed by Julian Eisel

release/scripts/startup/bl_ui/properties_data_curve.py

@@ -126,7 +126,7 @@ class DATA_PT_shape_curve(CurveButtonsPanel, Panel):
             col = layout.column()
             col.separator()
 
-            sub = col.column()
+            sub = col.column(heading="Curve Deform", align=True)
             sub.prop(curve, "use_radius")
             sub.prop(curve, "use_stretch")
             sub.prop(curve, "use_deform_bounds")