tests: Use a fresh instance as a workaround

Waiting seems like a perfect recipe for another flaky test, so let's better be
safe.

Author: The-Compiler

tests/integration/features/misc.feature

@@ -295,8 +295,8 @@ Feature: Various utility commands.
         # WORKAROUND to prevent the "Painter ended with 2 saved states" warning
         # Might be related to https://bugreports.qt.io/browse/QTBUG-13524 and
         # a weird interaction with the previous test.
-        When I wait 1s
-        And I set content -> enable-pdfjs to true
+        And I have a fresh instance
+        When I set content -> enable-pdfjs to true
         And I set completion -> download-path-suggestion to filename
         And I set storage -> prompt-download-directory to true
         And I open data/misc/test.pdf