Search for case insensitive 'allow'

Failure: UiObjectNotFoundException: UiSelector[TEXT=Allow]
Testcase is failing because matching is case sensitive.
CTS is searching for element with text='Allow' whereas
on device it is "ALLOW"

Bug: 132672007
Test: atest ExternalStorageHostTest
Change-Id: I4f26dfcf5702c2f78f5f57f0e7f7d5d85e63054c
1 file changed