x11/hs-xmobar: Fix the weather plugin
Since the source weather plugin uses switched fully to SSL
the plugin (using HTTP) fails.
The fix by upstream is to omit HTTP_CONDUIT flag on the plugin.
It is backported from upstream here, until their next release.

Reviewed by: arrowd (maintainer, Haskell@)
Approved by: arrowd (maintainer, Haskell@)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19403