(Temporarily) Fixed issue with Get Cookies test

The `Get Cookies` test started to fail. It was written to expect
just the another and test cookies but was also receiving the far_future
cookie. I'm a bit unsure as to why this wasn't failing sooner. I would
have expected this cookie to also appear. So not sure what was happening
here. Git blame shows this has been unchanged for a while.

I have updated the expected return value from get cookies. I do see some
possible improvements. The previous check allowed for the order to be swapped.
With three that is a bit more complicated. Instead of going into a complex
check for any order I am going to leave this till we see that appear.

Author: emanlove

atest/acceptance/keywords/cookies.robot

@@ -9,8 +9,8 @@ Library           DateTime
 *** Test Cases ***
 Get Cookies
     ${cookies}=    Get Cookies
-    Should Match Regexp    ${cookies}
-    ...    ^(test=seleniumlibrary; another=value)|(another=value; test=seleniumlibrary)$
+    Should Be Equal As Strings    ${cookies}
+    ...    another=value; test=seleniumlibrary; far_future=timemachine
 
 Get Cookies As Dict
     ${cookies}=    Get Cookies        as_dict=True