Fix T76397: Missing value property on Clear Mask pie menu

Without this value defined it was reusing the same 1.0 value after using
fill mask, so it was not working.

Reviewed By: jbakker

Maniphest Tasks: T76397

Differential Revision: https://developer.blender.org/D7699

release/scripts/startup/bl_ui/space_view3d.py

@@ -5282,6 +5282,7 @@ class VIEW3D_MT_sculpt_mask_edit_pie(Menu):
         op.mode = 'INVERT'
         op = pie.operator("paint.mask_flood_fill", text='Clear Mask')
         op.mode = 'VALUE'
+        op.value = 0.0
         op = pie.operator("sculpt.mask_filter", text='Smooth Mask')
         op.filter_type = 'SMOOTH'
         op.auto_iteration_count = True