Revert "Resolves: tdf#95629 import also 0x0D as rich EditCell, not only 0x0A"

This reverts commit 22ebafe8897239696f46df6f093054d16285004a.

It seems to break various sc.subsequentcheck targets.
diff --git a/sc/source/filter/oox/richstring.cxx b/sc/source/filter/oox/richstring.cxx
index 7484bbf..b415876 100644
--- a/sc/source/filter/oox/richstring.cxx
+++ b/sc/source/filter/oox/richstring.cxx
@@ -375,7 +375,7 @@ bool RichString::extractPlainString( OUString& orString, const oox::xls::Font* p
    if( (maTextPortions.size() == 1) && !maTextPortions.front()->hasFont() && !lclNeedsRichTextFormat( pFirstPortionFont ) )
    {
        orString = maTextPortions.front()->getText();
        return orString.indexOf( '\x0A' ) < 0 && orString.indexOf( '\x0D' ) < 0;
        return orString.indexOf( '\x0A' ) < 0;
    }
    return false;
}