[WPE] LayoutTests/fast/block/positioning passing unexpectedly

Unreviewed test gardening.

This test was failing as expected in all ports (see webkit.org/b/230593,
and 243008@main where we added this test expectation as failing in all ports
of WebKit due to lack of IFC support regarding gaps between glyphs when
kerning is on, particularly when content spans across multiple inline
boxes like this test). At some point, the WPE expectations were updated,
but the GTK and WPE expectation files for this test should be matching.

Moved GTK expectation up to GLib expectations; now WPE fails - as GTK did
(and does) - as expected.

* LayoutTests/platform/glib/fast/block/positioning/056-expected.txt: Renamed from LayoutTests/platform/gtk/fast/block/positioning/056-expected.txt.
* LayoutTests/platform/wpe/fast/block/positioning/056-expected.txt: Removed.

Canonical link: https://commits.webkit.org/267536@main