... for My Documents and My Templates.

It seems customary to name XDG_*_DIR in all uppercase.  This also
fixes buffer overrun IIUC, as osl_readLine() does not return the
newline delimiter.

Change-Id: If85ca7e6abe663e29d36b65a08d358d3d7d27c4b
Reviewed-on: https://gerrit.libreoffice.org/67741
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>