tg.sh/pre-commit.sh: do not rely on word-splitting inside braces

tg.sh/pre-commit.sh: do not rely on word-splitting inside braces

This ought to result in three arguments to echo:

    word=go
    echo ${word:+and "$word"}

Just as though it was written like so:

    echo and go

Some older shell implementations end up behaving like this:

    echo "and go"

That breaks numerous things and can easily be avoided by
moving the splitting whitespace outside of the braces like so:

    echo ${word:+and} ${word:+"$word"}

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>