Remove wrong conditional in Origin trustworthy check

It might block WebUI from logging in under specific network configurations.

Fix up 130c0d8.
PR #21972.

src/webui/webapplication.cpp

@@ -783,10 +783,6 @@ bool WebApplication::isOriginTrustworthy() const
     if (m_isHttpsEnabled)
         return true;
 
-    // client is on localhost
-    if (env().clientAddress.isLoopback())
-        return true;
-
     return false;
 }