Fix tess_eval shader in barycentric tests

One of output parameters in tessellation evaluation shader
in barycentric tests had a signed integer type which caused
a type mismatch since both possible geometry and fragment
shaders expected an unsigned type for the corresponding
input parameter.

Affects:

dEQP-VK.fragment_shading_barycentric.*.data.shader_combos.with_tess_shader.*
dEQP-VK.fragment_shading_barycentric.*.data.shader_combos.with_tess_geom_shader.*

Components: Vulkan

VK-GL-CTS issue: 4919

Change-Id: I3b7c60cab0d5450c98006800a50730afec75fe81

external/vulkancts/modules/vulkan/fragment_shading_barycentric/vktFragmentShadingBarycentricTests.cpp

@@ -1666,7 +1666,7 @@ void FragmentShadingBarycentricTestCase::initMiscDataTessPrograms(SourceCollecti
 		"${dataStruct}\n"
 		"\n"
 		"layout (location=0) in ${typePrefix} inData[]${typeSuffix};\n"
-		"struct OutDataStruct {int idx; ${typePrefix} data${typeSuffix};};\n"
+		"struct OutDataStruct {uint idx; ${typePrefix} data${typeSuffix};};\n"
 		"layout (location=0) flat out OutDataStruct outParam;\n"
 		"\n"
 		"void main (void)\n"