[pitivi] tests: Remove duplicate check_requirements call

[Alexandru Băluț <alexbalut src gnome org>]

commit f37bd61311844f9b3a0bd8c5eb5d3b0c8cbe5466
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Wed Oct 9 22:35:08 2019 +0200

    tests: Remove duplicate check_requirements call
    
    It's called already in __init__.py

 tests/common.py | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/tests/common.py b/tests/common.py
index a6c6b730..a4229cc2 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -91,10 +91,7 @@ def __create_settings(proxyingStrategy=ProxyingStrategy.NOTHING,
 
 def create_pitivi_mock(**settings):
     app = mock.MagicMock()
-
     app.write_action = mock.MagicMock(spec=Pitivi.write_action)
-    check.check_requirements()
-
     app.settings = __create_settings(**settings)
     app.proxy_manager = ProxyManager(app)