profcollectd: Change data directory group to system

This allows the system server to read the reports for uploading.

Test: manual
Bug: 178561556
Bug: 183487233
Change-Id: I537333760737dec5ba7d39a7ee6bac3f3d3418c6
Merged-In: I537333760737dec5ba7d39a7ee6bac3f3d3418c6
(cherry picked from commit 791c277789eaed56b901b4f0a5a3656e5930c935)
1 file changed