Make shaper's override_features() override user features as well
The override_features is used to override features that are normally
discretionary features, but in a specific shaper are for various
reasons desired to be bolted on or off, because they've been used
for inherent shaping. As such, it makes sense that they also
override user features. Ie. if user turned 'liga' on, we don't
want Khmer shaping to become broken... Or turn 'clig' off...
Fixes https://github.com/harfbuzz/harfbuzz/issues/1310
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