Remove CSPMiddleware since it is enabled by default in the upstream sentry (#2434)

remove CSPMiddleware since it is enabled by default in the upstream sentry

Author: oioki

sentry/sentry.conf.example.py

@@ -322,8 +322,6 @@ def get_internal_network():
 # Content Security Policy settings
 ##############################################
 
-if "csp.middleware.CSPMiddleware" not in MIDDLEWARE:
-    MIDDLEWARE = ("csp.middleware.CSPMiddleware",) + MIDDLEWARE
 # CSP_REPORT_URI = "https://{your-sentry-installation}/api/{csp-project}/security/?sentry_key={sentry-key}"
 CSP_REPORT_ONLY = True