Hide widgets in the Work Profile tab when Work apps are paused.

The filter was missing from the refactor in ag/25502473.
There aren't currently WidgetPicker tests that would catch this behavior
but there should be.

Bug: 317452407
Test: Ran existing widget tests, looking at adding work profile tests.
Flag: none
Change-Id: I2ce8464a1c76505bfe7ce8cf4280bb5b576cdb1d