webview: remove MATCH_DEBUG_TRIAGED_MISSING.

MATCH_DEBUG_TRIAGED_MISSING is a deprecated alias for
MATCH_DIRECT_BOOT_AUTO, which has no effect here as we aren't fetching
component information, so just remove it.

Bug: 310653407
Test: atest CtsWebkitTestCases; atest WebViewUpdateServiceTest
Flag: NONE removing obsolete hidden API dependency
Change-Id: I6a6d49a9f14bb7163c80a6d092080bf564bc0ced