fix: try_many_times: retry 5 times instead of 60 #6811
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If 5 times is not enough, 60 will probably not be enough either.
This is mainly an attempt of improving the situation with
deltachat/deltachat-desktop#3959.
The
remove_accountRPC call would make the RPC serverstop responding to all other requests,
which is basically equivalent to a one minute hang.
Additionally,
try_many_timesappears to be unnecessary after#5814 (comment).