color: add parenthesis to help readability

Took me a multiple attempts until my mind eventually stop reading:

  auto = coloropt = 'auto'

And properly reads:

  auto = colorpopt == 'auto'

So we add parenthesis to clarify.

hgext/color.py

@@ -168,7 +168,7 b' def _terminfosetup(ui, mode):'
 def _modesetup(ui, coloropt):
     global _terminfo_params
 
-    auto = coloropt == 'auto'
+    auto = (coloropt == 'auto')
     always = not auto and util.parsebool(coloropt)
     if not always and not auto:
         return None