Remove add padding test on weights fot CL DirectConvolutionLayer

Removing test externally adding padding to weights after configure()
In order to properly use the export_to_cl_image feature the weights are
padded with the right values and should not be changed

Resolves: COMPMID-4493

Change-Id: I48e7dc06403f126897b3bbe3d9fc7200782631e5
Signed-off-by: Manuel Bottini <manuel.bottini@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5611
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/fixtures/DirectConvolutionLayerFixture.h b/tests/validation/fixtures/DirectConvolutionLayerFixture.h
index 38efe47..d21a2e7 100644
--- a/tests/validation/fixtures/DirectConvolutionLayerFixture.h
+++ b/tests/validation/fixtures/DirectConvolutionLayerFixture.h
@@ -171,7 +171,7 @@
         ARM_COMPUTE_ASSERT(bias.info()->is_resizable());
         ARM_COMPUTE_ASSERT(dst.info()->is_resizable());
 
-        add_padding_x({ &src, &weights, &bias, &dst }, data_layout);
+        add_padding_x({ &src, &bias, &dst }, data_layout);
 
         // Allocate tensors
         src.allocator()->allocate();