Fix T65108: GPencil Sculpt mode select tools don't work

Move the sculpt keymap from the mode to the tool.

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -1466,6 +1466,10 @@ class _defs_gpencil_sculpt:
             icon_prefix="ops.gpencil.sculpt_",
             type=bpy.types.GPencilSculptSettings,
             attr="sculpt_tool",
+            tooldef_keywords=dict(
+                operator="gpencil.sculpt_paint",
+                keymap="3D View Tool: Sculpt Gpencil, Paint",
+            ),
         )