The try command detects shell type from $SHELL variable. When bash is
launched from fish, $SHELL is still set to /usr/bin/fish, causing try
to output fish syntax which fails in bash with syntax errors.
Explicitly set SHELL=/bin/bash for the try init call to ensure correct
shell detection.
Update fzf completion source path from /usr/share/bash-completion/completions/fzf
to /usr/share/fzf/completion.bash to match the actual file location on Arch Linux.
