AK: Make Point constructors constexpr

Author: https://github.com/frhun
Commit: 325042f2b7
Pull-request: https://github.com/SerenityOS/serenity/pull/14282
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/MacDue

Userland/Libraries/LibGfx/Point.h

@@ -22,14 +22,14 @@ class Point {
 public:
     Point() = default;
 
-    Point(T x, T y)
+    constexpr Point(T x, T y)
         : m_x(x)
         , m_y(y)
     {
     }
 
     template<typename U>
-    Point(U x, U y)
+    constexpr Point(U x, U y)
         : m_x(x)
         , m_y(y)
     {