Fix bug in task update logic - computes isNewProgress0 incorrectly

[imdigitalashish]

controllers/tasks.js computes isNewProgress0 incorrectly because !!req.body.percentCompleted !== undefined is always true.

Replace with req.body.percentCompleted !== undefined.

File & line: controllers/tasks.js line 378

[pankajtyagi1601]

Hi @imdigitalashish, I'd like to work on this issue. I've understood the problem with the !!req.body.percentCompleted !== undefined logic and will update it as suggested to req.body.percentCompleted !== undefined.

Please let me know if anyone is already working on this or if there are any additional considerations I should keep in mind before submitting a PR. Thanks!