more old sampler scheduler compatibility

[w-e-w]

Description

this is an addition (not alternative) to the fix missionfloyd made

• Allow old sampler names in API #15656

• due to sampler and scheduler is split in Scheduler selection in main UI #15333

issues similar to the start appearing in extensions

• [Bug]: bad sampler name: DPM++ 2M Karras #15677

basically similar issues would occur to all extensions that calls StableDiffusionProcessing on ther own
as there are written for older verison of webui that have that sampler and scheduler combined

this change should not have any effect on any currently working implementations
only fixes those that are inputting invalid sampler scheduler

note:
this fix can not be implemented inside Scripts.callbacks as not all extensions will call the scripts

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[itsklimov]

up!
Waiting for the fix

[keithbandit98]

tried to change the files but doesnt work for me