Fix T80905: GPencil: bones cannot be selected using Ctrl + LMB (with Left Selection Preference)

Was missing a dedicated entry for LMB select, this is to be consistent
with how it is done for meshes.

Maniphest Tasks: T80905

Differential Revision: https://developer.blender.org/D8935

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -3656,6 +3656,12 @@ def km_grease_pencil_stroke_weight_mode(params):
         *_template_items_context_panel("VIEW3D_PT_gpencil_weight_context_menu", params.context_menu_event),
     ])
 
+    if params.select_mouse == 'LEFTMOUSE':
+        # Bone selection for combined weight paint + pose mode.
+        items.extend([
+            ("view3d.select", {"type": 'LEFTMOUSE', "value": 'PRESS', "ctrl": True}, None),
+        ])
+
     return keymap