Update the dismiss reason to be correct when removing via caption menu

Flag: com.android.wm.shell.bubble_bar
Test: manual - enable bubble bar, expand a bubble, tap the caption
               handle, tap "dismiss bubble"
             => verify bubble is dismissed with correct int value in
                protolog
Bug: 333915922
Change-Id: I95844ac5b0263c9d6de8e2329b012d56d320c89a