webui: Fix lintian issues on webui-controller package

* debhelper-but-no-misc-depends
* wrong-bug-number-in-closes
* changelog-is-dh_make-template
* helper-templates-in-copyright
* copyright-has-url-from-dh_make-boilerplate
* copyright-contains-dh_make-todo-boilerplate
* readme-debian-contains-debmake-template

Change-Id: Ib5548d791eaca79e376ead5734a8ada288765a54
Merge "webui: Fix lintian issues on webui-controller package"