GPencil: Smooth and Subdivision variable/setting naming

On second thought, these might be better names for these... I'm still not 100%
happy with these, but they will do for now.

(Best results currently seem to be with smooth 0.7, and subdivision steps 1 or 2)

release/scripts/startup/bl_ui/properties_grease_pencil_common.py

@@ -626,9 +626,8 @@ class GreasePencilDataPanel:
         layout.separator()
         col = layout.column(align=True)
         col.label(text="New Stroke Quality:")
-        split = col.split()
-        split.prop(gpl, "smooth_drawfac")
-        split.prop(gpl, "subdivision")
+        col.prop(gpl, "pen_smooth_factor")
+        col.prop(gpl, "pen_subdivision_steps")
 
 
 class GreasePencilToolsPanel: