Bug fix sync service

[ashishkumar468]

• Set Sync automatically to content resolver in MainActivity

[tests-checker]

Could you please add tests to make sure this change works as expected?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (backend-overhaul@cd57552). Click here to learn what that means.
The diff coverage is 0%.

@@                Coverage Diff                 @@
##             backend-overhaul   #3069   +/-   ##
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  Coverage                    ?   5.35%           
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  Files                       ?     268           
  Lines                       ?   11798           
  Branches                    ?     960           
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  Hits                        ?     632           
  Misses                      ?   11115           
  Partials                    ?      51

Impacted Files	Coverage Δ
...r/free/nrw/commons/contributions/MainActivity.java	0% <0%> (ø)

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