Avoid E947 if a hidden terminal buffer exist when quit vim

[zhuxi0511]

Is your feature request related to a problem? Please describe.
if a hidden terminal buffer exist when quit vim, the quit will be interrupted and report E947: Job still running in buffer

the problem like this link description:
https://vi.stackexchange.com/questions/24664/job-still-running-in-buffer-while-qa

Describe the solution you'd like
When create terminal, may add an option for ++kill setting. Support vim quit will not be interrupted

Additional context
My simple adjustment like this