Changes to Keepass2 plugins

* Prefer original source of KeePassHttp, since dlech only included to resolve
  incompatibility with the application-indicator plugin (which was merged
  into upstream after a long period of inactivity)
* Prefer own build of TrayTOTP which resolves same incompatibility
- Disable application-menu plugin, this seems to cause weird window behavior
  and incorrect menu items for Most Recently Used and TrayTOTP