Fix bias typo

src/core/hle/D3D8/Direct3D9/Xb.hlsl

@@ -33,8 +33,7 @@ int toXboxIndex(float src0) {
 	// some titles produce values just below the threshold of the next integer.
 	// We can add a small bias to make sure it's bumped over the threshold
 	// Test Case: Azurik (divides indexes 755, then scales them back in the vertex shader)
-	return floor(src0) + 0.00000001; // TODO test
-}
+	return floor(src0 + 0.0001); // TODO test
 
 float x_dph(float4 src0, float4 src1) {
 	return dot(src0, src1) + src1.w;