Fix failed to locate output device on invalid configurations

[Nonary]

Description

It fixes an issue that caused sunshine to fail to start if users provided an invalid display name in the configuration file.
It also fixes a false positive in the ddprobe tool, which could cause duplicateoutput() test failed [0x887a0004] errors

Issues Fixed or Closed

• Fixes Error "Failed to locate an output device" after deactivating one of two displays in windows #939

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[CLAassistant]

All committers have signed the CLA.

[ReenigneArcher]

Updating w/ rebase to make this easier to fix conflicts after adjusting clang-format rules