This reverts commit 59059d00c2, as it effectively
did nothing, as rvalues can bind to `const &` just fine.
<https://gerrit.libreoffice.org/c/core/+/133747> "Acutally do prevent using
O[U]String::subView on temporaties" would have fixed that, but (a) it didn't
find any actual mis-uses and (b) rather would have required a handful of
legitimate cases to be dressed up with o3tl::temporary now, so is arguably not
worth it.
Change-Id: I923d0db2646dc8ea66d1b2a8b709ee2cd7a60ed4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134058
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>