Replace divider for more uniquiness

[kuriot]

Hello.

Current divider for parts of a prompt breaks Lora Control extension divider. It's just a simple fix to be sure that single "@" is not stripped from prompts.

[kuriot]

It also seems to replace in Lora Control constructions commas to commas with spaces:
<lora:1@0,0@1> -> <lora:1@0, 0@1> but extension still works with these spaces.

[AIrjen]

Amazing! Thank you! I’m not at home until sunday evening, I will have a good look soon 👍🏻

[AIrjen]

Back from a trip! Looks good, thanks for taking the time to implement a solution.