web_renderjs_ui: increase height of iframe

The default size of iframe is too small for CKEditor to display dialogs
properly. Increase the height so that CKEditor display dialog boxes
correctly.

/reviewed-on !1010

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.css

@@ -442,7 +442,7 @@ svg text {
 }
 iframe {
   width: 100%;
-  height: 20em;
+  height: 30em;
   background-color: #FFFFFF;
 }
 img {

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.xml

@@ -75,9 +75,7 @@
         </item>
         <item>
             <key> <string>content_type</string> </key>
-            <value>
-              <none/>
-            </value>
+            <value> <string>text/css</string> </value>
         </item>
         <item>
             <key> <string>default_reference</string> </key>
@@ -264,7 +262,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1574438678.87</float>
+                              <float>1574438679.87</float>
                               <string>UTC</string>
                             </tuple>
                           </state>

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

@@ -565,7 +565,7 @@ svg {
 
 iframe {
   width: 100%;
-  height: 20em;
+  height: 30em;
   background-color: @colorbackground;
 }