Increased modsecurity bodynofileslimit so larger files can be synced

[Iolaum]

Temporary(?) fix to #959

Needs testing. I added functionality in update.sh to update the config for people who already have modsecurity running, please check that I haven't overlooked something (or misunderstood chow check_distro works). The intent is that the fix would only apply to people who are in buster and have enabled, at some point, modsecurity.

People who enable modsecurity for the first time get the updated config file.

[Iolaum]

Minor note:

I tried testing my PR with

$ sudo ncp-update Iolaum:dev1
INFO: updating to development branch 'Iolaum:dev1'
Downloading updates
warning: Could not find remote branch Iolaum:dev1 to clone.
fatal: Remote branch Iolaum:dev1 not found in upstream origin
No internet connectivity

but it looks like it's not considered a branch by github. Not sure if there's another way to test it through the ncp-update process. I 'll look into it when I can.

[nachoparker]

many thanks for this. I can merge it to devel so we can both test it with ncp-update devel once it's ready (or any other branch)

[Iolaum]

Refactored the code per to your suggestions and re applied commits on top of current devel branch.

[nachoparker]

looks good, thanks. I merged it into devel, so it can be tested with ncp-update devel

[Iolaum]

@nachoparker Tested PR with sudo ncp-update devel and it worked. A video file that wasn't syncing before (reverted my manual fix) did sync afterwards.

[nachoparker]

great, many thanks!!