test_runner: remove redundant check from coverage

The code coverage reporting logic already filters out URLs that
don't start with 'file:', so there is no need to also filter
out URLs that start with 'node:'.

lib/internal/test_runner/coverage.js

@@ -378,8 +378,7 @@ function mergeCoverage(merged, coverage) {
     const { url } = newScript;
 
     // Filter out core modules and the node_modules/ directory from results.
-    if (StringPrototypeStartsWith(url, 'node:') ||
-        StringPrototypeIncludes(url, '/node_modules/') ||
+    if (StringPrototypeIncludes(url, '/node_modules/') ||
         // On Windows some generated coverages are invalid.
         !StringPrototypeStartsWith(url, 'file:')) {
       continue;