Fix Set Windows Size being too small for Travis (#1192)

Author: aaltat

atest/acceptance/windows.robot

@@ -60,10 +60,10 @@ Get and Set Window Size
 
 Set Window Size using strings
     [Tags]  Known Issue Internet Explorer    Known Issue Safari
-    Set Window Size    456    654
+    Set Window Size    600    800
     ${width}    ${height}=    Get Window Size
-    Should Be Equal    ${width}    ${456}
-    Should Be Equal    ${height}    ${654}
+    Should Be Equal    ${width}    ${600}
+    Should Be Equal    ${height}    ${800}
 
 Get and Set Window Position
     [Tags]  Known Issue Chrome    Known Issue Safari