Fix broken shallowMount with GlModal
What does this MR do?
This fixes a broken master issue #196190 (closed)
From the commit message:
**How?**
Making this spec a full mount instead.
**Why?**
The test was failing with an error in our
GlModal that `$refs.modal.show` was not
a function. This is because shallowMount
will stub the internal b-modal. So that we're
not messing with internals too much, let's just
do a full mount here :)