Per simulation overrides not used by GUI for default_targets

[slaymaker1907]

Describe the bug

desired_targets is always ignored in favor of "Num Enemies" in the GUI Options even if specified under the "Simulate" tab.

Expected behavior

"Num Enemies" should only be the default if no value is explicitly given for desired_targets.

To Reproduce

1. Set "Num Enemies" in Options to "1"
2. Setup any multiarget simulation (i.e. set desired_targets="2") using the "Simulate" tab.

You can also repro this pretty easily by creating a multitarget sim in raidbots then copy pasting the raw simc input into the simc GUI.

Additional information

• SimulationCraft 910-01 for World of Warcraft 9.1.0.39335 Live (hotfix 2021-07-12/39335, git build shadowlands 35126a3)
• Not including specific sim because this seems to be a general problem