[meta.reflection.queries]/4.3 Fix syntax in example

The parenthesis in the example seem to do the wrong grouping. To fix,
remove one set of parens. This brings the example in line with P2996R13
from which this wording originates.

Author: birbacher

source/meta.tex

@@ -3984,7 +3984,7 @@
 
 static_assert(^^x != ^^y);                          // OK, \tcode{r} and \tcode{y} are different variables so their
                                                     // reflections compare different
-static_assert(object_of((^^x) == object_of(^^y)));  // OK, because \tcode{y} is a reference
+static_assert(object_of(^^x) == object_of(^^y));    // OK, because \tcode{y} is a reference
                                                     // to \tcode{x}, their underlying objects are the same
 \end{codeblock}
 \end{example}