Increase the char limit for the bluetooth tethering strings.

Longer summary text for the bluetooth tethering should be supported for
translation to other languages.

Bug: 36626585
Bug: 36627493
Bug: 36635108
Test: builds
Change-Id: Ia1409520443fd05c54a6c28fc292dd39b1c198b2
(cherry picked from commit 6d17af4d642302c8947f088c7336db8c5e6f2061)
1 file changed