Use cmd.Name when generating completion script
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This PR fixes a bug in completion scripts when the binary is called in any other way than by simply typing its name. Examples:
When installing my program
emuwith Homebrew,os.Args[0]is/opt/homebrew/Cellar/emu/0.2.16/bin/emu.When running my program
emulike this:./emu, thenos.Args[0]is./emu.This breaks the completion script.
I think using root command's
cmd.Nameis a good way to fix it.Also discussed here