Remove contentSecurityPolicy - UI leftover (#1805)

Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>

hawkbit-security-core/src/main/java/org/eclipse/hawkbit/security/HawkbitSecurityProperties.java

@@ -28,10 +28,6 @@ public class HawkbitSecurityProperties {
     private final Dos dos = new Dos();
     private final Cors cors = new Cors();
 
-    /**
-     * Content Security policy Header for Manager UI.
-     */
-    private String contentSecurityPolicy;
     /**
      * Secure access enforced.
      */