Remove Edge tests, it does not seem to be much stable now

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/tests/test_selenium.py

@@ -269,10 +269,6 @@ EXTRA_PLATFORMS = {
         'browserName': 'chrome',
         'platform': 'XP',
     },
-    'MSEdge': {
-        'browserName': "microsoftedge",
-        'platform': "Windows 10",
-    },
     'MSIE9': {
         'browserName': 'internet explorer',
         'version': '9',