erp5_web_renderjs_ui: fixup invalid class selector

See nexedi/erp5@ea219b74

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.css

@@ -1186,7 +1186,7 @@ div[data-gadget-scope='header'] .ui-header ul {
     padding-left: 24pt;
   }
 }
-.gadget-content .ui-field-contain > label:not(:is-invalid) {
+.gadget-content .ui-field-contain > label:not(.is-invalid) {
   color: hsl(0, 0%, 42%);
 }
 .gadget-content .required > .ui-field-contain > label {

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_nojqm_css.xml

@@ -75,7 +75,9 @@
         </item>
         <item>
             <key> <string>content_type</string> </key>
-            <value> <string>text/css</string> </value>
+            <value>
+              <none/>
+            </value>
         </item>
         <item>
             <key> <string>default_reference</string> </key>
@@ -244,7 +246,7 @@
                   </item>
                   <item>
                       <key> <string>serial</string> </key>
-                      <value> <string>986.53918.32237.3225</string> </value>
+                      <value> <string>989.18940.32400.648</string> </value>
                   </item>
                   <item>
                       <key> <string>state</string> </key>
@@ -262,7 +264,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1600941690.9</float>
+                              <float>1610465136.37</float>
                               <string>UTC</string>
                             </tuple>
                           </state>

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

@@ -1369,7 +1369,7 @@ div[data-gadget-scope='header'] .ui-header {
 
   //Label
   .ui-field-contain {
-    & > label:not(:is-invalid) {
+    & > label:not(.is-invalid) {
       color: @colorlabel;
 
     }