We start a search page with a request code which is same as
"uninstall" request code. The root cause is we handle same
reuqest code for different event.
We redefine an unique request code for "search" feature.
Fixes: 124775813
Test: Click search and back to App info screen.
Change-Id: I8ab21c30b605bcb65b6d4bd9fceb749a65a49f80
062d4acf45