Fix terminal.style.spinner config value

[Grub4K]

terminal.styles.spinner has no effect, which seems to be a typo:

--- a/src/hatch/cli/terminal.py
+++ b/src/hatch/cli/terminal.py
@@ -198,7 +198,7 @@ class Terminal:
-                setattr(self, attribute, f'_style_{option}')
+                setattr(self, f'_style_{option}', style)

While this simple fix solves the problem, this can cause a runtime error later while trying to show a spinner. I thought this might be even worse, so I created a special case where we call Spinner() instead and catch KeyError. To get the original error message we have to use e.args[0] (just Python things). The else branch was kept alive since it was probably created for later extensibility.

[ofek]

Thank you!