Android-example: add missing properties in AndroidManifest.xml

After changing android target SDK version to 31, some missing values has
to be defined in AndroidManifest.xml.

AndroidManifest.xml template was updated in qtbase in:
56dee3de5e4ac1c4d37a2c5e27361e7ddbdea1a7 commit. In case when example
uses its own AndroidManifest.xml file, it need to be updated separately.

* android:exported="true": because the manifest sets an intent-filter,
and it then has to explicitly to avoid the warning [1].
* android:allowBackup="true": this has to be explicitly set, we set it
to the default value here [2].
* android:fullBackupOnly="false": SDK 23+ use this to deteremine to
user auto backup or not, we set it to the default value here [3].

[1] https://developer.android.com/guide/topics/manifest/activity-
element#exported
[2] https://developer.android.com/guide/topics/manifest/application-
element#allowbackup
[3] https://developer.android.com/guide/topics/manifest/application-
element#fullBackupOnly

Pick-to: 6.5 6.2 5.15
Change-Id: Ic38b7bd686ee98a1a821d5c73a9b969f1b23d2a2
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

0 files changed, 0 insertions, 0 deletions