erp5_base: add image/x-ms-bmp in contribution_registry/image_mimetype

bt5/erp5_base/PathTemplateItem/portal_contribution_registry/image_mimetype.xml

@@ -88,6 +88,7 @@
                         <string>image/tiff</string>
                         <string>image/tiff-fx</string>
                         <string>image/x-icon</string>
+                        <string>image/x-ms-bmp</string>
                         <string>image/x-xbm</string>
                         <string>image/x-xbitmap</string>
                         <string>image/webp</string>