Fix STATIC_ROOT in defaults

Reasoning:

- This is breaking the UI in official image builds of devel
- This is always being overridden in our packaging
- PROJECTS_ROOT and JOBOUTPUT_ROOT also hardcode /var/lib/awx

awx/settings/defaults.py

@@ -105,7 +105,7 @@ def IS_TESTING(argv=None):
 
 # Absolute filesystem path to the directory where static file are collected via
 # the collectstatic command.
-STATIC_ROOT = os.path.join(BASE_DIR, 'public', 'static')
+STATIC_ROOT = '/var/lib/awx/public/static'
 
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/dev/howto/static-files/