From sql/highlights.scm, remove @type capture

@type is too generic and captures many different things, e.g. function
calls and table references. It doesn't capture builtin types, which are
captured by @type.builtin.

The outcome is that function calls are highlighted as types. Same for
table names.

I guess one can make an argument that tables are composite types in SQL,
but it doesn't feel right to highlight them in the same way as e.g.
`DOUBLE`.

To fix this issue, just remove the @type capture rule.

queries/sql/highlights.scm

@@ -12,9 +12,6 @@
   (keyword_array)
 ] @function.call
 
-(object_reference
-  name: (identifier) @type)
-
 (relation
   alias: (identifier) @variable)