Previously there were two copies of a function called CutLines which
were used to remove a method from a string containing BASIC source code.
These have both been replaced with a helper method on SbModule that
returns the source without the given method.
Change-Id: I70c4a4ffe40085bd090ee6823c46154c057468e4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/207062
Tested-by: Jenkins
Reviewed-by: Neil Roberts <nroberts@libreoffice.org>