SceneTools: adapt test to Containers::Pair having different Debug output.

The minmax() returned std::pair originally, which was printed as (a, b);
now Containers::Pair is printed as {a, b}. Which I like better, anyway.

src/Magnum/SceneTools/Test/SceneConverterImplementationTestFiles/info-meshes-bounds.txt

@@ -1,26 +1,26 @@
 Mesh 0:
   Level 0: 2 vertices @ Lines (0.2 kB, {})
     Position @ Vector3, offset 0, stride 12
-      Bounds: ({0.1, -0.1, -0.2}, {0.2, 0, 0.2})
+      Bounds: {Vector(0.1, -0.1, -0.2), Vector(0.2, 0, 0.2)}
     Tangent @ Vector3, offset 24, stride 12
-      Bounds: ({0.2, -0.2, 0.2}, {0.3, 0.8, 0.8})
+      Bounds: {Vector(0.2, -0.2, 0.2), Vector(0.3, 0.8, 0.8)}
     Bitangent @ Vector3, offset 48, stride 12
-      Bounds: ({0.3, 0.2, 0}, {0.4, 0.9, 1})
+      Bounds: {Vector(0.3, 0.2, 0), Vector(0.4, 0.9, 1)}
     ObjectId @ UnsignedShort, offset 72, stride 2
-      Bounds: (12, 155)
+      Bounds: {12, 155}
     Normal @ Vector3bNormalized, offset 76, stride 3
-      Bounds: ({-1, 0, 0}, {0, 1, 1})
+      Bounds: {Vector(-1, 0, 0), Vector(0, 1, 1)}
     Custom(25:normalButCustomSoNoBoundsPrinted) @ Vector3b, offset 76, stride 3
     TextureCoordinates @ Vector2, offset 84, stride 8
-      Bounds: ({0.5, 0.5}, {1.5, 0.5})
+      Bounds: {Vector(0.5, 0.5), Vector(1.5, 0.5)}
     Color @ Vector4, offset 100, stride 16
-      Bounds: ({0.6, 0.2, 0.2, 0}, {1, 0.4, 0.4, 0.2})
+      Bounds: {Vector(0.6, 0.2, 0.2, 0), Vector(1, 0.4, 0.4, 0.2)}
     ObjectId @ UnsignedInt, offset 132, stride 4
-      Bounds: (15, 337)
+      Bounds: {15, 337}
     JointIds @ UnsignedByte[3], offset 140, stride 3
-      Bounds: (6, 27)
+      Bounds: {6, 27}
     Weights @ Half[3], offset 146, stride 6
-      Bounds: (0.125, 0.75)
+      Bounds: {0.125, 0.75}
     3 indices @ UnsignedByte, offset 0, stride 1 (0.0 kB, {})
-      Bounds: (3, 176)
+      Bounds: {3, 176}
 Total mesh data size: 0.2 kB