[erp5_web_renderjs_ui] Reduce iframe height

Iframe are only used with the editors, which now have a maximize feature

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.css

@@ -424,7 +424,7 @@ svg text {
 }
 iframe {
   width: 100%;
-  height: 80vh;
+  height: 20em;
   background-color: #FFFFFF;
 }
 img {

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.xml

@@ -242,7 +242,7 @@
             </item>
             <item>
                 <key> <string>serial</string> </key>
-                <value> <string>965.11726.55807.5120</string> </value>
+                <value> <string>965.11760.24459.2133</string> </value>
             </item>
             <item>
                 <key> <string>state</string> </key>
@@ -260,7 +260,7 @@
                     </tuple>
                     <state>
                       <tuple>
-                        <float>1517389540.5</float>
+                        <float>1517390712.66</float>
                         <string>UTC</string>
                       </tuple>
                     </state>

bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui/erp5css.less.txt

@@ -538,7 +538,7 @@ svg {
 
 iframe {
   width: 100%;
-  height: 80vh;
+  height: 20em;
   background-color: @colorbackground;
 }