Only output facetool parameters if enhancing faces

[db3000]

A partial solution to #1101, don't print the default facetool parameters if face enhancement is not even enabled. This doesn't solve the saving or loading issue, but it will make the output less confusing.

For example of the prompt text rendering being confusing see: #1108 (comment)

Example with no facetool, no parameters:

invoke> test -s1
[121] outputs/img-samples/000060.1125788153.png: "test" -s 1 -S 1125788153 -W 512 -H 512 -C 7.5 -A k_lms

Example with gfpgan:

invoke> test -s1 -G1
[122] outputs/img-samples/000061.3072109442.png: "test" -s 1 -S 3072109442 -W 512 -H 512 -C 7.5 -A k_lms -G 1.0 -ft gfpgan

Example with codeformer:

invoke> test -s1 -G2 -ft codeformer -cf 0.75
[123] outputs/img-samples/000062.2347390908.png: "test" -s 1 -S 2347390908 -W 512 -H 512 -C 7.5 -A k_lms -G 2.0 -ft codeformer -cf 0.75

[lstein]

Thank you!