tdf#145004 remove fontwork text padding for case ScaleX=true

tdf#145004 remove fontwork text padding for case ScaleX=true

The setting ScaleX=true in property TextPath in CustomShapeGeometry
is used in import of WortArt of kind 'Follow Path' from MS Office. The
value 'true' means, that the text is not stretched to the path but its
original font size is used as long as enough place is available.

The method CalculateHorizontalScalingFactor() has increased the
scaling factor by 10 percent to make a 'padding'. That results in a
too short text and a gap at start and/or end. The problem is not only
visible in imported shapes but in user designed Fontwork shapes too.
PowerPoint has no 'padding'. Currently our own preset Fontwork shapes
always use ScaleX=false and therefore are not affected.

I have not found any reason for such padding. So this patch removes it.

Change-Id: I7f2c4eb9101be1f13b006d4178ffbe75eb4ed55a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123295
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>