chore(travis): disable captureTimeout

All of the recent failures were caused by too much load on SL, not
an actual problem.

I think a proper solution will be:
karma-runner/karma-sauce-launcher#37

karma-shared.conf.js

@@ -113,6 +113,7 @@ module.exports = function(config, specificOptions) {
 
     config.logLevel = config.LOG_DEBUG;
     config.transports = ['websocket', 'xhr-polling'];
+    config.captureTimeout = 0; // rely on SL timeout
 
     config.browserStack.build = buildLabel;
     config.browserStack.startTunnel = false;