fix: define browser resolution for all chrome tests (#431)

Specifying window resolution for UI tests resolves
`ElementNotInteractableException` error when element to be found with
xpath is not visible and browser page has to be scrolled down.

Author: mkolasinski-splunk

pytest_splunk_addon_ui_smartx/base_test.py

@@ -154,9 +154,9 @@ def get_local_chrome_opts(headless_run):
         chrome_opts.add_argument("--ignore-ssl-errors=yes")
         chrome_opts.add_argument("--ignore-certificate-errors")
         chrome_opts.add_argument("--disable-dev-shm-usage")
+        chrome_opts.add_argument("--window-size=1280,768")
         if headless_run:
             chrome_opts.add_argument("--headless")
-            chrome_opts.add_argument("--window-size=1280,768")
         return chrome_opts
 
     @staticmethod