Tabs in user tasks become spaces when syncing

[alexr00]

Testing #141275

1. Create users tasks on machine A:

{
	"version": "2.0.0",
	"tasks": [
		{
			"label": "echo",
			"type": "shell",
			"command": "echo Hello one!"
		}
	]
}

2. Turn on sync on machine A
3. Turn on sync on machine B and see the tasks sync ✔ Note that both A and B have tabs (not spaces) for indent in the user tasks.
4. Turn off sync on B.
5. Change the task command on A to be "echo Hello two!" and on B to be "echo Hello three!". Double check that all indents are still tabs.
6. Turn sync back on on B
7. Get a sync conflict on B ✔ But, see that there are whitespace differences in the conflict 🐛:
   
   The left (remote) side correctly has tabs. The right (local) side now has spaces.