[DO NOT MERGE] Change the LPNH flag to read from server flag "ENABLE_LONG_PRESS_NAV_HANDLE_MPR".

Flag: ENABLE_LONG_PRESS_NAV_HANDLE_MPR
Test: Manual
Bug: 309689303
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:75183ceed565aca0174e4e9707d6cb59dea2fce5)
Merged-In: Ib695b3d6ac3f40ee53b6b64bb6b121e7b34d4b07
Change-Id: Ib695b3d6ac3f40ee53b6b64bb6b121e7b34d4b07
1 file changed