software/theia: set warnOnPotentiallyInsecureHostPattern

Eventhough our current pattern is not the most secure, we have no other
choice for now that to use such insecure patterns.

In https://erp5js.nexedi.net/#/bug_module/20210819-20614EE we track possible
improvements to this situation.

software/theia/software.cfg

@@ -254,6 +254,11 @@ template =
   inline:{
       "private": true,
       "theia": {
+          "backend": {
+              "config": {
+                  "warnOnPotentiallyInsecureHostPattern": false
+              }
+          },
           "frontend": {
               "config": {
                   "applicationName": "Theia SlapOS",
@@ -283,7 +288,8 @@ template =
                       "plantuml.render": "PlantUMLServer",
                       "gitlens.remotes": [{ "domain": "lab.nexedi.com", "type": "GitLab" }],
                       "java.home": "${java-jdk:location}"
-                  }
+                  },
+                  "warnOnPotentiallyInsecureHostPattern": false
               }
           },
           "generator": {