docx import: don't apply complex font size to non-complex font
docx import: don't apply complex font size to non-complex font

OOXML spec says:
"[szCs] specifies the font size which shall be applied to all
complex script characters in the contents of this run when displayed"

Change-Id: I0faf599e38ef5a2e2005bb6f98874639be7d8287
Reviewed-on: https://gerrit.libreoffice.org/1454
Reviewed-by: Miklos Vajna <16f13092e03e3d9e997de904d0f86cc803fb6ef7@suse.cz>
Tested-by: Miklos Vajna <16f13092e03e3d9e997de904d0f86cc803fb6ef7@suse.cz>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core