Don't reset mode for OP_REQUEST_INSTALL_PACKAGES.

Settings allows the user to control the app op if it's not in the
default mode, regardless of whether the app has requested the
permission, so we should not reset it.

Fixes: 150819885
Test: atest CtsNoPermissionTestCases25
Change-Id: Iba87574febe8c0f8ed5c779c19f00b39d811a835