Math: test that constructing vector from parts can be done implicitly.

src/Math/Test/Vector3Test.cpp

@@ -122,7 +122,7 @@ void Vector3Test::constructOneValue() {
 
 void Vector3Test::constructParts() {
     constexpr Vector2 a(1.0f, 2.0f);
-    constexpr Vector3 b(a, 3.0f);
+    constexpr Vector3 b = {a, 3.0f};
     CORRADE_COMPARE(b, Vector3(1.0f, 2.0f, 3.0f));
 }
 

src/Math/Test/Vector4Test.cpp

@@ -119,7 +119,7 @@ void Vector4Test::constructOneValue() {
 
 void Vector4Test::constructParts() {
     constexpr Vector3 a(1.0f, 2.0f, 3.0f);
-    constexpr Vector4 b(a, 4.0f);
+    constexpr Vector4 b = {a, 4.0f};
     CORRADE_COMPARE(b, Vector4(1.0f, 2.0f, 3.0f, 4.0f));
 }