reliably detect parent shell in rbenv init

`$SHELL` variable is a terrible way of detecting the current shell
because it's not even supposed to reflect the current shell; it's meant
for keeping the value of the default shell for programs to start.

If an explicit `<shell>` argument wasn't passed to `rbenv init`, it
tries to detect the shell by getting the name of its parent process. If
this fails, it falls back on the value of `$SHELL` as before.

Furthermore, `rbenv init` will set the RBENV_SHELL variable in the
current shell to the value of the detected shell so that `sh-shell` and
`sh-rehash` commands don't have to repeat the detection.

libexec/rbenv-sh-rehash

@@ -7,7 +7,7 @@ if [ "$1" = "--complete" ]; then
   exec rbenv-rehash --complete
 fi
 
-shell="$(basename "$SHELL")"
+shell="$(basename "${RBENV_SHELL:-$SHELL}")"
 
 # When rbenv shell integration is enabled, delegate to rbenv-rehash,
 # then tell the shell to empty its command lookup cache.