Adds an explicit `android:exported="true"`.

Commit 553bada3296ec8ffb8f15ddca1bb295a40e9b366
requires every AndroidManifest to specify android:exported for every
activity with an intent filter.

Setting these to true to preserve default behavior.

Bug: 168216028
Change-Id: Ieed6f9ff3f79f8d590b5ffac1409d67656afae8d
1 file changed