COMPMID-1049 : Harris corners test failure

Decreased the threshold so as to identify enough corners and be able to accomodate enough error tolerance.

Change-Id: I5b769e5beee92f191d761a22dc60f60f1fcd76e0
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/130896
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/tests/validation/Helpers.cpp b/tests/validation/Helpers.cpp
index 6e7ec8d..0707c6a 100644
--- a/tests/validation/Helpers.cpp
+++ b/tests/validation/Helpers.cpp
@@ -103,7 +103,7 @@
     HarrisCornersParameters params;
 
     std::mt19937                           gen(library->seed());
-    std::uniform_real_distribution<float>  threshold_dist(0.f, 0.01f);
+    std::uniform_real_distribution<float>  threshold_dist(0.f, 0.001f);
     std::uniform_real_distribution<float>  sensitivity(0.04f, 0.15f);
     std::uniform_real_distribution<float>  euclidean_distance(0.f, 30.f);
     std::uniform_int_distribution<uint8_t> int_dist(0, 255);