tests: Remove dhparam volume

No longer necessary for the majority of tests.

test/test_custom/test_defaults-location.yml

@@ -2,7 +2,6 @@ nginx-proxy:
   image: nginxproxy/nginx-proxy:test
   volumes:
     - /var/run/docker.sock:/tmp/docker.sock:ro
-    - ../lib/ssl/dhparam.pem:/etc/nginx/dhparam/dhparam.pem:ro
     - ./my_custom_proxy_settings.conf:/etc/nginx/vhost.d/default_location:ro
     - ./my_custom_proxy_settings_bar.conf:/etc/nginx/vhost.d/web3.nginx-proxy.local_location:ro
 

test/test_custom/test_defaults.yml

@@ -4,7 +4,6 @@ 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
       - ./my_custom_proxy_settings.conf:/etc/nginx/proxy.conf:ro
 
   web1:

test/test_custom/test_location-per-vhost.yml

@@ -4,7 +4,6 @@ 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
       - ./my_custom_proxy_settings.conf:/etc/nginx/vhost.d/web1.nginx-proxy.local_location:ro
 
   web1:

test/test_custom/test_per-vhost.yml

@@ -4,7 +4,6 @@ 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
       - ./my_custom_proxy_settings.conf:/etc/nginx/vhost.d/web1.nginx-proxy.local:ro
 
   web1:

test/test_custom/test_proxy-wide.yml

@@ -4,7 +4,6 @@ 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
       - ./my_custom_proxy_settings.conf:/etc/nginx/conf.d/my_custom_proxy_settings.conf:ro
 
   web1: