Fix blue/red heads with same cmd

Fix blue/red heads with same cmd

* hydra.el (hydra--make-defun): Update.
(hydra--head-name): Change signature, since body is needed to determine
the color. When the head will exit, add "-and-exit" to its name (except
for the nil head and body).
(defhydra): Update the call to `hydra--head-name', since it's not valid
until the head has a hint.

* hydra-test.el (hydra-blue-toggle): Update.
(hydra-amaranth-vi): Update.
(hydra-zoom-duplicate-1): Update.
(hydra-zoom-duplicate-2): Update.

Fixes #84