Fixes an issue causing incorrect textbox positions when the containing
shape is anchored 'as character' inside RTL text, with the
DoNotMirrorRtlDrawObjs compatibility flag set.
Change-Id: I58cade8b91925dda188a1ef8fd078ccfdc3fea56
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172938
Tested-by: Jenkins
Reviewed-by: Jonathan Clark <jonathan@libreoffice.org>