profile_manager: Simplify UUID's two param constructor, operator==, and operator bool

We can use the constructor initializer list and just compare the
contained u128's together instead of comparing each element
individually. Ditto for comparing against an invalid UUID.

src/core/hle/service/acc/profile_manager.h

@@ -21,16 +21,14 @@ struct UUID {
     u128 uuid = INVALID_UUID;
     UUID() = default;
     explicit UUID(const u128& id) : uuid{id} {}
-    explicit UUID(const u64 lo, const u64 hi) {
-        uuid[0] = lo;
-        uuid[1] = hi;
-    };
+    explicit UUID(const u64 lo, const u64 hi) : uuid{{lo, hi}} {}
+
     explicit operator bool() const {
-        return uuid[0] != INVALID_UUID[0] || uuid[1] != INVALID_UUID[1];
+        return uuid != INVALID_UUID;
     }
 
     bool operator==(const UUID& rhs) const {
-        return std::tie(uuid[0], uuid[1]) == std::tie(rhs.uuid[0], rhs.uuid[1]);
+        return uuid == rhs.uuid;
     }
 
     bool operator!=(const UUID& rhs) const {