Prevent spawning multiple pinning popups on right click

The dismiss logic only checks for `ACTION_DOWN` events, but when the
user frequently right-clicks OR right-press-move-release, we get
multiple `ACTION_MOVE` events instead, which are ignored by the dismiss
logic of the previous popup instance.

Attached screen recordings to the bug.

Bug: 362475367
Flag: EXEMPT bugfix
Test: manual
Change-Id: I665c3127e4b449a8f4c71e443cc6ae07c1bf2794