Increase captureTimeout in karma configuration (#364)

This should help to reduce failures related to the #307 issue.

Also, this change moves karma config to the [correct
location](https://karma-runner.github.io/6.4/config/configuration-file.html)
- it did not have any effect before that

karma.config.d/wasm/config.js → karma.config.d/karma.conf.js

@@ -1,3 +1,12 @@
+module.exports = function(config) {
+    config.set({
+        // https://karma-runner.github.io/6.4/config/configuration-file.html#capturetimeout
+        // default timeout 60_000, but looks like it is not enough for macOS on GitHub runner
+        // increasing the timeout should help to reduce number of failures
+        captureTimeout: 120_000,
+    });
+};
+
 // A workaround from https://android-review.googlesource.com/c/platform/frameworks/support/+/3413540
 (function() {
     const originalExit = process.exit;