Inconsistent Behavior in TextureLODGroups when setting NumStreamedMips=0

A licensee has reported that it is not possible to disable texture streaming of a given TextureLODGroup by setting "NumStreamedMips=0" in their device profiles. Currently, using 0 results in the same behavior as using -1, which defaults to having streaming turned on. This behavior is inconsistent, as the user would expect to be able to disable texture mip streaming by using 0.

Steps to Reproduce

Repro steps

• Get Lyra at //UE5/Release-5.7/...@48893968
• Add "Windows DeviceProfile" section to Lyra\Config\DefaultDeviceProfiles.ini
• Set "NumStreamedMips=0" in all TextureLODGroups entries
• Create a Windows package
• Set a breakpoint in "FStreamingRenderAsset::UpdateDynamicData" at the "if (NumStreamedMips[LODGroup] > 0)" line
• Debug the game
• See that "NumStreamedMips[LODGroup]==0" case is always managed in the same way as "NumStreamedMips[LODGroup]==-1" case when computing "MinAllowedMips".