tests: Remove dhparam volume

No longer necessary for the majority of tests.

test/test_upstream-name/test_predictable-name.yml

@@ -13,4 +13,3 @@ services:
     image: nginxproxy/nginx-proxy:test
     volumes:
       - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ../lib/ssl/dhparam.pem:/etc/nginx/dhparam/dhparam.pem:ro

test/test_upstream-name/test_sha1-name.yml

@@ -13,6 +13,5 @@ services:
     image: nginxproxy/nginx-proxy:test
     volumes:
       - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ../lib/ssl/dhparam.pem:/etc/nginx/dhparam/dhparam.pem:ro
     environment:
       SHA1_UPSTREAM_NAME: "true"