Temporality remove app handle test from cuj6p/e

This CL temporality removes the app handle test from cuj6p/e.
Currently, the app handle in the connected display is broken
(b/428084525).

Flag: EXEMPT - fix test
Bug: 427839971
Test: ConnectedDisplayCujSmokeTests#cuj6p/e
Change-Id: I97df380da0715e8213ed2805e5fa583edae453ab