Fix T82542: Boundary brush crash with dyntopo

This brush needs to be disabled for dyntopo as it stores its custom data
and deforms from original coordiantes.

Reviewed By: sergey

Maniphest Tasks: T82542

Differential Revision: https://developer.blender.org/D9516

source/blender/makesdna/DNA_brush_types.h

@@ -870,6 +870,7 @@ typedef enum eBrushUVSculptTool {
         SCULPT_TOOL_DRAW_SHARP, \
         SCULPT_TOOL_SLIDE_RELAX, \
         SCULPT_TOOL_ELASTIC_DEFORM, \
+        SCULPT_TOOL_BOUNDARY, \
         SCULPT_TOOL_POSE, \
         SCULPT_TOOL_DRAW_FACE_SETS, \
         SCULPT_TOOL_PAINT, \