[utility] don't set zcorrection by default

The code in the utility module only checks if the value is 'true'. There
is no need to set it to 'false'; just don't set it at all.

This should make it easier to enable/disable (uncomment vs value
change).

templates/zimrc

@@ -28,9 +28,9 @@ zprompt_theme='steeef'
 # Utility
 #
 
-# Enables command correction prompts; setopt CORRECT
+# Uncomment to enable command correction prompts; 'setopt CORRECT'
 # See: http://zsh.sourceforge.net/Doc/Release/Options.html#Input_002fOutput
-zcorrection='false'
+#zcorrection='true'
 
 #
 # Syntax-Highlighting