e2eTests: changed getScreenshotName to replace invalid path character…

…s with '_'.

This currently only affects one file and fixes it so generated screenshot will now match the reference screenshot: end-to-end-test/remote/screenshots/reference/download_tab_-_nsclc_tcga_broad_2016_for_query_egfr:_mut=t790m_amp_element_chrome_1600x1000.png

NOTE: there are four other files that previously had invalid path characters, but they have already been renamed and the tests already updated

end-to-end-test/shared/wdio/getScreenshotName.js

@@ -8,11 +8,15 @@ module.exports = function getScreenshotName(basePath, browserName) {
         var browserWidth = browserViewport.width;
         var browserHeight = browserViewport.height;
 
+        // regular expression that matches invalid path characters for some systems (such as Windows)
+        var invalidChars = /[<>:"\/\\|?*]/g;
+
         return path.join(
             basePath,
             `${testName}_element_chrome_1600x1000.png`
                 .toLowerCase()
                 .replace(/ /g, '_')
+                .replace(invalidChars, '_')
         );
     };
 };