uitest oneprocess mode: default to this and clean up one test

Now that all UITests either use gb_UITest_use_oneprocess or
gb_UITest_avoid_oneprocess, it's possible to change the default to use
oneprocess mode out of the box.

Also clean up one test depend on this default. A later commit can clean
up all other uses of gb_UITest_use_oneprocess, which is now redundant.

Finally fix a typo in sw/UITest_sw_sidebar.mk.

Change-Id: I6ae2ac5deb9c8ced9007c5b7da32743f9a2599ad
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158471
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

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