Resolve @CaseyCarter's review suggestions

Co-authored-by: Casey Carter <Casey@Carter.net>

tests/std/tests/P1614R2_spaceship/test.cpp

@@ -60,28 +60,22 @@ struct SynthOrdered {
 
 struct OrderedChar {
     OrderedChar() = default;
-    OrderedChar(const char c) : c(c){};
+    OrderedChar(const char c) : c(c) {}
 
     OrderedChar& operator=(const char& other) {
         c = other;
         return *this;
     }
 
+    auto operator<=>(const OrderedChar&) const = default;
+
     operator char() const {
         return c;
     }
 
     char c;
 };
 
-auto operator<=>(const OrderedChar& left, const OrderedChar& right) {
-    return left.c <=> right.c;
-}
-
-auto operator==(const OrderedChar& left, const OrderedChar& right) {
-    return left.c == right.c;
-}
-
 struct WeaklyOrderedChar : OrderedChar {};
 struct WeaklyOrderdByOmissionChar : OrderedChar {};
 struct PartiallyOrderedChar : OrderedChar {};