Fix crash if log file can't be opened #1937
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If a log file is specified and can't be opened (e.g.
lf -log /foo), then the application willpanic. This happens after the TUI has been initialized so the terminal is left in a messed up state, instead of being restored after a normal exit.This commit moves the code for opening the log file to before the TUI initialization, so that a failure will cause
lfto abort with an error message without affecting the terminal.