Don't call AdjustPagebreak() in a loop, this seems useless

There doesn't seem to be any reason to call this function more than once
on the same cell as the existing implementations are idempotent and it's
difficult to see why this should ever not be the case.

src/html/htmprint.cpp

@@ -152,7 +152,7 @@ int wxHtmlDCRenderer::FindNextPageBreak(const wxArrayInt& known_pagebreaks,
         return wxNOT_FOUND;
 
     pos += m_Height;
-    while (m_Cells->AdjustPagebreak(&pos, known_pagebreaks, m_Height)) {}
+    m_Cells->AdjustPagebreak(&pos, known_pagebreaks, m_Height);
     return pos;
 }