tests: fix meson test env setup to make sure we use the right gst-plugin-scanner
This is the same fix that was applied in gst-plugins-good in gst-plugins-good!603 (merged) and fixes the testsuite running in gst-build.
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This is the same fix that was applied in gst-plugins-good in gst-plugins-good!603 (merged) and fixes the testsuite running in gst-build.