don't highlight the ':' char after the field names

This way we're consistent with how we're highlighting the properties.

Author: zaid

syntax/rec.vim

@@ -12,7 +12,7 @@ syntax keyword recKeyword %mandatory %prohibit %rec %sort %unique
 syntax keyword recKeyword %unique
 
 syntax match recComment "\v^#.*$"
-syntax match recField "\v^[a-zA-Z0-9_]*\:"
+syntax match recField "\v^[a-zA-Z0-9_]*"
 syntax match recComparisonOperator "\v\>?\<?\!?\=?" contained
 
 syntax keyword recType int bool range real size line regexp date contained containedin=recTypeAssociation,recTypeDeclaration