Increase limits to Special:MyCourses activity feeds

Change the time and count limits for the Special:MyCourses
activity feeds to show up to 5 days worth of course-related edits
(up from 2) and up to 200 entries (up from 42).

Change-Id: I8b1a038a3eb577a5ad44bd80e1575fd2ad866643
Merge "Increase limits to Special:MyCourses activity feeds"