Can't use variable REDIS_URL if another one use REDIS_URL in its name, ex: WONDER_REDIS_URL

[grizmio]

Description of problem

Can't use variable REDIS_URL if another one use REDIS_URL in its name, ex: WONDER_REDIS_URL
For weird reasons out of my control, our project uses REDIS_URL for REDIS and CELERY_REDIS_URL in the same container.
It would be easier to have meetings with all projects manager and I am currently working on it but it slow as hell.
Currently the plugin check if REDIS_URL is present in the list as string of one line is present, so it thinks WONDER_REDIS_URL is REDIS_URL every time I link redis with the app. If I use the flag -a REDIS_URL it believes it already exists

How reproducible

Just use an APP with a variable FOO_REDIS_URL setted to any value and try to link redis to it

Actual Results

The plugin uses DOKKU_REDIS_AQUA_URL

Expected Results

Link the app using REDIS_URL

How (deb/make) and where (AWS, VirtualBox, physical, etc.) was Dokku installed?:

dokku was installed from github

Additional information

root@claritywave-transicion-staging:~# dokku redis:info xxxxxxxxxxxxxxx-redis
=====> xxxxxxxxxxxxxxx-redis redis service information
       Config dir:          /var/lib/dokku/services/redis/xxxxxxxxxxxxxxx-redis/config
       Config options:                               
       Data dir:            /var/lib/dokku/services/redis/xxxxxxxxxxxxxxx-redis/data
       Dsn:                 redis://:5c7fxxxxxxxxxxxxxxxxa2e0b5@dokku-redis-xxxxxxxxxxxxxxx-redis:6379
       Exposed ports:       -                        
       Id:                  ae02708xxxxxxxxxxxxxxxxxxxxb0bc
       Internal ip:         172.17.0.8               
       Initial network:                              
       Links:               unificacion-staging      
       Post create network:                          
       Post start network:                           
       Service root:        /var/lib/dokku/services/redis/xxxxxxxxxxxxxxx-redis
       Status:              running                  
       Version:             redis:7.2.4              

I wrote a quick ugly fix that im currently using and made a pull request in hopes someone with better skills than mine could make a proper fix.
#249
Thanks for taking time to read this and sorry about my bad english.