fix: incorrect usage of grep

[yacchi]

Summary

Message displayed when executing a command that does not specify a version, and the error message is output at the same time because of incorrect usage of grep.

Extract from macOS man:

-F, --fixed-strings
Interpret pattern as a set of fixed strings (i.e. force grep to behave as fgrep).
-f file, --file=file
Read one or more newline separated patterns from file. Empty pattern lines match every input line. Newlines are not considered part of a pattern. If file is empty, nothing is matched.

Expected:

> go
No version set for command go
Consider adding one of the following versions in your config file at 
go-sdk 1.17

Actual(in head branch):

> go
grep: go-sdk 1.17
go-sdk system: No such file or directory
No version set for command go
Consider adding one of the following versions in your config file at 
go-sdk 1.17

[Stratus3D]

Thanks for the PR @yacchi !