[gnome-calculator/ci-screenshots] Remove pkill as it's not found

[Robert Roth <robertroth src gnome org>]

commit 5d63957d41b86f434c8bc3a8e96a916fa50400a2
Author: Robert Roth <robert roth off gmail com>
Date:   Sat Jul 14 22:04:58 2018 +0300

    Remove pkill as it's not found

 .gitlab-ci.yml | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5b21ab0a..2327757a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -20,8 +20,6 @@ build-fedora:
     - sleep 5
     - DISPLAY=:0 import -window root screenshot.jpg
     - sleep 5
-    - pkill gnome-calculator
-    - pkill Xvfb
   artifacts:
     paths:
     - screenshot.jpg