Fix new logo size

lettre-UTC.cls

@@ -57,7 +57,7 @@ Merci d'utiliser la comande \texttt{\@backslashchar adresse} dans le préambule.
               xshift=52.2mm, %shifting around
               yshift=-10mm, inner sep = 0pt] 
              at (current page.north west) %left upper corner of the page
-             {\includegraphics[height=21.7mm]{__EXTERNAL_ASSETS__/logo_UTC.pdf}}; 
+             {\includegraphics[width=42.2mm]{__EXTERNAL_ASSETS__/logo_UTC.pdf}}; 
         \end{tikzpicture}
 \fi          
 }