Program hangs when executing `subdir_fzf` on a large directory

[Jacky-Lzx]

Problem description:

1. When executing subdir_fzf command in a large directory, e.g., /, the view goes to the command line, and it waits for outputs.
2. Now press ctrl+c will exit joshutu, instead of terminating subdir_fzf execution.

Why is this a problem?

• It is not a good practice to do subdir_fzf on such a big directory, but sometimes I may accidentally hit the key and execute subdir_fzf.
• When I realize it I want to terminate the execution and return back to joshuto, but now the ctrl+c directly terminates joshuto.

Steps to reproduce:

1. go to /.
2. execute subdir_fzf, and the program hangs.
3. press ctrl+c, and joshutu exits instead of terminating subdir_fzf and returning back to joshutu.

[Jacky-Lzx]

I think the program is waiting for the output of FZF_DEFAULT_COMMAND here:

https://github.com/kamiyaa/joshuto/blob/95d304fb04a87fbb2534759177f6cd27f5816143/src/commands/subdir_fzf.rs#LL17C1-L28C7

Commenting it and not redirecting stdin of fzf on line 31 seem to fix the problem.

I think it's fine because fzf will call FZF_DEFAULT_COMMAD by itself (I'm not sure).

[kamiyaa]

Closed via https://github.com/kamiyaa/joshuto/pull/309