fdo#60462 - Small errors in the layout margins of the text boxes

As you can see on this screenshot
https://bugs.freedesktop.org/attachment.cgi?id=74399 there was a margin
problem. The X-position of the text box is at 0.05, but the
width was only 0.88 so we had 0.02 _extra_ on the right side. This is the
width of that little margin error. Fixing it by setting Layoutsize width
to 0.90, so we have on both side a nice 0.05 margin.

Change-Id: Id712ce3695a760c8f955413c9392c008733d7fb9
Reviewed-on: https://gerrit.libreoffice.org/2970Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

sd/source/core/sdpage.cxx

@@ -1052,7 +1052,7 @@ Rectangle SdPage::GetLayoutRect() const
         {
             aLayoutPos.X() += long( aLayoutSize.Width() * 0.05 );
             aLayoutPos.Y() += long( aLayoutSize.Height() * 0.234 );
-            aLayoutSize.Width() = long( aLayoutSize.Width() * 0.88 );
+            aLayoutSize.Width() = long( aLayoutSize.Width() * 0.9 );
             aLayoutSize.Height() = long( aLayoutSize.Height() * 0.58 );
             aLayoutRect.SetPos(aLayoutPos);
             aLayoutRect.SetSize(aLayoutSize);