PWGLF:: To add the namspace for abs

[navneetkumar231295]

Dear Experts,

I am trying to run the o2-analysis-lf-k892pmanalysis task for testing. However, I have noticed that abs(v0.mLambda() - massLambda0) always returns a zero value. When I include the namespace, it works fine. Therefore, I kindly request that these changes be committed.

Thanks,
With Regards,
Navneet Kumar

[BongHwi]

Hello @navneetkumar231295 , we have more abs() without std:: in this task, such as in line 385.
Could you apply the update to all them together?

[navneetkumar231295]

Hello @navneetkumar231295 , we have more abs() without std:: in this task, such as in line 385. Could you apply the update to all them together?

Hello, Bong. I made the changes