newsboat command: now kills newsboat first

newsboat will only allow itself to have one instance running, so
attempting to open a new newsboat instance while there is an existing
newsboat process will result in failure. Ordinarily, this shouldn't be a
problem. However sometimes newsboat remains running even after the
window is closed, requiring it to be killed prior to opening a new one.

This change causes the SUPER-F3 keybinding to use pkill to terminate any
running newsboat process prior to launching a new one, and should
prevent this situation from occurring.

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