Revert "Add explicit module parameter to workaround bug in "most popular" widget"

This reverts commit 64326c14bb498d3a9ec44b51136cfcad704bc5a5.
Remove test route `/mea/add`

The test route `/mea/add` was introduced by mistake in the first code dump,
commit 279f8e0459fd4a7a42d37659136591a8a3fcd034.

Closes #5.