Allow change AE type while not streaming (even if AE is on)

[Nir-Az]

Tracked on [DSO-18943]

[Nir-Az]

@maloel UT change is coming.. I want to see it's failing first.

Update # 1:
It will not fail as it only runs on FW >= 5.15...
I will run the test locally and update it
Update # 2:
Done
Log before test update:

Verify cannot set when auto exposure on
-E- Traceback (most recent call last):
  File "C:\Work\Git\librealsense\unit-tests\live/d400/test-depth_ae_mode.py", line 33, in <module>
    test.check_equal(depth_sensor.get_option(rs.option.auto_exposure_mode), REGULAR)
    left  : 1.0
    right : 0.0
Test failed

[maloel]

Should the gating be dependent on the FW version?

[Nir-Az]

Gated was removed as discussed