AutoAppPermissionsFragment: Initialize mIsFirstLoad

Initialize the mIsFirstLoad boolean so that we log the required metrics
when the fragment is loaded and viewed for the first time.

Bug 202241220

Test: ats-tradefed run commandAndExit ats -m GtsPermissionControllerHostTestCases -t android.permissioncontroller.gts.PermissionControllerHostTest#testViewAppPermissionsFragment

Change-Id: I963d206c0bcfb79a8f3d720c124936c55f3901c2