Optimization of Task Deletion

[Chitravansh]

Problem

Need to search for the task in the list for its deletion.

Solution

Instead of finding the task by index in self.tasks and then removing it, the task can be removed directly using the index from the selection.

Changes Proposed

Instead of using self.tasks.remove(task), which searches through the list, I directly used the index to delete the task using del self.tasks[selected_index.row()].
This removes the task directly by index, avoiding the extra search operation that remove() performs.

This optimization makes the deletion process faster and simpler, especially if the list of tasks becomes long.

Other Changes

Added my name to contributor.js

[Chitravansh]

@Chitravansh Please Star ⭐️ the repo to earn 'hacktober-accepted' label for the event.