Fix #108814: Right Click doesn't cancel 3D View navigation

Entry for `VIEW_MODAL_CANCEL` was not included during refactor of
navigation operators (67203c0ec8)

Pull Request: https://projects.blender.org/blender/blender/pulls/108876

source/blender/editors/space_view3d/view3d_navigate.cc

@@ -97,6 +97,8 @@ static eV3D_OpEvent view3d_navigate_event(ViewOpsData *vod, const wmEvent *event
 {
   if (event->type == EVT_MODAL_MAP) {
     switch (event->val) {
+      case VIEW_MODAL_CANCEL:
+        return VIEW_CANCEL;
       case VIEW_MODAL_CONFIRM:
         return VIEW_CONFIRM;
       case VIEWROT_MODAL_AXIS_SNAP_ENABLE: