Since anchored objects can contain paragraphs, considering all
of them to be "firstParagraphs" would generally be considered
an incorrect result. Browsing through the existing uses of
IsFirstPara.*InSection I didn't see any that looked like
it should be considered true if IsInShape.

Since this is the kind of gotcha that that the programmer
should be aware of, add it directly into the function instead
of requiring each use to have an additional qualification.

The following ooxml unit tests match these conditions, but
only one was fixed - the rest were unaffected since they just
avoided adding/removing dummy paragraphs.
fdo79540.docx - 5
tblppr-shape.docx - 5
ooo47778-3.odt- 5
ooo47778-4.odt- 5
textbox-rounded-corners.docx - 7
n780563.docx - 8
missing-path.docx - 10
floating-tables-anchor.docx - 10
tdf117805.odt - 11  (fixed - prevented extra section paragraphs)

Change-Id: I841475e214c194a673321c1229d9254dd07205f8
Reviewed-on: https://gerrit.libreoffice.org/59659
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>