UI: Use property split in vertex paint symmetry panels

Set property split in the higher level panel functions so that it carries
over to buttons added after. Also discard the redundant "Symmetry"
to make sure there is enough space for the checkbox label.

release/scripts/startup/bl_ui/space_view3d_toolbar.py

@@ -124,11 +124,7 @@ class View3DPanel:
 
 # Used by vertex & weight paint
 def draw_vpaint_symmetry(layout, vpaint, mesh):
-
     col = layout.column()
-    col.use_property_split = True
-    col.use_property_decorate = False
-
     row = col.row(heading="Mirror", align=True)
     row.prop(mesh, "use_mirror_x", text="X", toggle=True)
     row.prop(mesh, "use_mirror_y", text="Y", toggle=True)
@@ -955,16 +951,18 @@ class VIEW3D_PT_tools_weightpaint_symmetry(Panel, View3DPaintPanel):
 
     def draw(self, context):
         layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+
         tool_settings = context.tool_settings
         wpaint = tool_settings.weight_paint
         mesh = context.object.data
+
         draw_vpaint_symmetry(layout, wpaint, mesh)
 
-        col = layout.column()
-        row = col.row(align=True)
-        row.prop(mesh, 'use_mirror_vertex_group_x')
-
-        row = layout.row(align=True)
+        col = layout.column(align=True)
+        col.prop(mesh, 'use_mirror_vertex_group_x', text="Vertex Group X")
+        row = col.row()
         row.active = mesh.use_mirror_vertex_group_x
         row.prop(mesh, "use_mirror_topology")
 
@@ -1033,8 +1031,12 @@ class VIEW3D_PT_tools_vertexpaint_symmetry(Panel, View3DPaintPanel):
 
     def draw(self, context):
         layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+
         tool_settings = context.tool_settings
         vpaint = tool_settings.vertex_paint
+
         draw_vpaint_symmetry(layout, vpaint, context.object.data)