UI: Force minimum reconnect delay of 1 second

Setting this to zero breaks reconnecting (and OBS) entirely as various
parts of the reconnect system do not handle zero values properly, and
there are also possible race conditions with the reconnect thread. Set a
minimum of 1 second to avoid this.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f