Try lower threshold for flaky maps

Author: camdecoster

test/image/compare_pixels_test.mjs

@@ -79,7 +79,7 @@ for (let mockName of allMockList) {
 
     let threshold = 0;
     if (flakyList.has(mockName)) threshold = 0.2;
-    else if (flakyListMaps.has(mockName)) threshold = 1; // This threshold means any colors will match
+    else if (flakyListMaps.has(mockName)) threshold = 0.7;
     if (virtualWebgl) threshold = Math.max(threshold, flakyVirtualWebgl.has(mockName) ? 0.7 : 0.4);
 
     if (mathjax3) mockName = 'mathjax3___' + mockName;