Revert "wpe: Properly respect LIBGL_ALWAYS_SOFTWARE"
This causes issues I didn't see: !2252 (comment 927633) Let's just tell people to use capsfilter to force software rendering in `wpesrc` for now. The intent was to allow forcing it easily in playbin2 for the CI, but we will do it some other way and see when time comes. This reverts commit 9415106b. Part-of: <!2273>
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