Set sampler max. anisotropy to 1.0f instead of 0.0f (valdidation)

Refs #277

shadowmappingomni/shadowmappingomni.cpp

@@ -242,7 +242,7 @@ public:
 		sampler.addressModeV = sampler.addressModeU;
 		sampler.addressModeW = sampler.addressModeU;
 		sampler.mipLodBias = 0.0f;
-		sampler.maxAnisotropy = 0;
+		sampler.maxAnisotropy = 1.0f;
 		sampler.compareOp = VK_COMPARE_OP_NEVER;
 		sampler.minLod = 0.0f;
 		sampler.maxLod = 1.0f;