fix some #includes in the Quartz plugin

Matthew Fernandezrequested to merge
smattr/4EEAF0CE-D0C3-479C-A9F1-A91B90168C2F into master

This reverts part of d80f685d that incorrectly updated paths to the header gvplugin_quartz.h. This mistake was not detected at the time as we did not have macOS CI. Thanks to Stephen for picking this up. Related to #1785 (closed).

@truenorth, can you confirm this fixes the compilation issue you emailed me about?

This plugin is clearly not being compiled in CI, as the previous code would not have worked. @magjac do you know how we go about enabling this?

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