In e5b6869 (part of #1283), a regression was introduced, which caused
`bash-it reload` to return with the working directory set to
`.bash_it` and the original working directory discarded.
The root cause is the function wrapper of `bash-it reload`, which has
always relied on the working directory not to change during execution
of the wrapped code. This assumption no longer holds with the changes
introduced in #1283.
This commit fixes the regression by using `pushd`/`popd` in `bash-it
reload`.
0fe631ea7c