remove provides/conflicts/replaces sections

pasystray is already the name of the package it will provide/conflict with
itself already, and having replace causes a lot of issues such as pacman
requesting to replace it with itself every update. (Thanks to justin8)
remove replaces section

Otherwise you cannot have both the git and non-git versions of pasystray in a
repo without it causing pacman to have a whinge every update. (Thanks to
justin8)
fix pkgver according to guidelines

https://wiki.archlinux.org/index.php/VCS_PKGBUILD_Guidelines#Git
(Thanks to justin8)