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Fix(clip): delete clipping region with restore (#73)

@hustcc please release a patch version after this pull request to version 2.2.1. 

Thanks!

* Fix(clip): delete clipping region with restore

Previously, the restore() method would update its pointer to the previous
clipping region (stackIndex = n-1) in the stack without deleting the current
clipping region (stackIndex = n). This caused problems for future save() calls,
which would push a new clipping region onto the stack at location n+1 while
only incrementing stackIndex to n, thus referencing the wrong region.

This commit fixes the issue by deleting the current clipping region when
restore() is called. By doing this, we lose the ability to inspect old
clipping regions, but this is easy to change in the future if it is desired.

* Address PR comments

Tests have been combined and make better use of the afterEach snapshots.

* Remove excess checks in test

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