Checkstyle: Category Design (a few more)

RecurringTask.java:21, VisibilityModifierCheck
Variable 'context' must be private and have accessor methods

SQLiteContentProvider.java:12, VisibilityModifierCheck
Variable 'persistanceHelper' must be private and have accessor methods

Change-Id: I1408b75a8dd95eecb04ce569b27fd765bc694281