rhi: displacement / tessellation manual test Metal memory alignment

This test was created with a work around for a Metal tessellation
pipeline memory alignment issue.  The workaround was to specify shader
stage in / out variable uv as vec3 rather than vec2.  A recent patch to
correct Metal tessellation pipeline memory alignment has now allowed
this test to use vec2 for variable uv as originally intended.

Change-Id: I6772c0e824e1e4b7e749dafa218f3fd8eba0e541
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

tests/manual/rhi/displacement/material.tesc

@@ -2,10 +2,10 @@
 
 layout(vertices = 3) out;
 
-layout(location = 0) in vec3 in_uv[];
+layout(location = 0) in vec2 in_uv[];
 layout(location = 1) in vec3 in_normal[];
 
-layout(location = 0) out vec3 out_uv[];
+layout(location = 0) out vec2 out_uv[];
 layout(location = 1) out vec3 out_normal[];
 
 layout(std140, binding = 0) uniform buf {

tests/manual/rhi/displacement/material.tese

@@ -2,7 +2,7 @@
 
 layout(triangles, fractional_odd_spacing, ccw) in;
 
-layout(location = 0) in vec3 in_uv[];
+layout(location = 0) in vec2 in_uv[];
 layout(location = 1) in vec3 in_normal[];
 
 //layout(location = 0) out vec2 out_uv;

tests/manual/rhi/displacement/material.vert

@@ -4,12 +4,12 @@ layout(location = 0) in vec3 position;
 layout(location = 1) in vec2 uv;
 layout(location = 2) in vec3 normal;
 
-layout(location = 0) out vec3 out_uv;
+layout(location = 0) out vec2 out_uv;
 layout(location = 1) out vec3 out_normal;
 
 void main()
 {
     gl_Position = vec4(position, 1.0);
-    out_uv = vec3(uv, 0.0);
+    out_uv = uv;
     out_normal = normal;
 }