Allow BG-FGS start on BOOT_COMPLETED if it's exempted for other reasons

Apps might be starting FGS on BOOT_COMPLTED and we limited it to only
the selected type of FGS if the BF-FGS allow reason is only due to
the BOOT_COMPLETED. However, if the app has other exemptions which
allow it to start FGS from the background, we should just honor it,
ignore the type requirement regarding the BOOT_COMPLETED exemption.

Bug: 335364900
Test: atest CtsAppTestCases:BootCompletedFgsStartTest
Change-Id: I35a99028d77b550ba6197cc18902b5a5a2cc3739