ci/zink: Drop glx-swap-copy xfails.

These now skip, since there are no preserved configs any more.

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Acked-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Martin Roukala <martin.roukala@mupuf.org>
Acked-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20798>

src/gallium/drivers/zink/ci/zink-anv-tgl-fails.txt

@@ -187,7 +187,6 @@ glx@glx-buffer-age vblank_mode=0,Fail
 
 glx@glx-make-current,Crash
 glx@glx-multi-window-single-context,Crash
-glx@glx-swap-copy,Fail
 glx@glx-swap-pixmap-bad,Fail
 glx@glx-tfp,Crash
 

src/gallium/drivers/zink/ci/zink-lvp-fails.txt

@@ -7,10 +7,6 @@ spec@arb_tessellation_shader@execution@variable-indexing@tes-both-input-array-ve
 # #6322
 spec@arb_framebuffer_object@fbo-blit-scaled-linear,Fail
 
-
-# #6905
-glx@glx-swap-copy,Fail
-
 #kopper regressions/changes
 glx@extension string sanity,Fail
 spec@egl_chromium_sync_control@conformance,Fail

src/gallium/drivers/zink/ci/zink-radv-navi10-fails.txt

@@ -27,7 +27,6 @@ glx@glx_ext_import_context@make current- multi process,Fail
 glx@glx_ext_import_context@make current- single process,Fail
 glx@glx_ext_import_context@query context info,Fail
 glx@glx-make-current,Crash
-glx@glx-swap-copy,Fail
 glx@glx-swap-pixmap-bad,Fail
 
 # #6322

src/gallium/drivers/zink/ci/zink-radv-vangogh-fails.txt

@@ -27,7 +27,6 @@ glx@glx_ext_import_context@make current- multi process,Fail
 glx@glx_ext_import_context@make current- single process,Fail
 glx@glx_ext_import_context@query context info,Fail
 glx@glx-make-current,Crash
-glx@glx-swap-copy,Fail
 glx@glx-swap-pixmap-bad,Fail
 
 # #6322