Fix C4244 warnings in AssetPlatformComponentRemover.cpp

[0x14307]

What does this PR do?

While building either a project or the engine itself, A C2220 error and two C4244 warnings would come up pertaining to AssetPlatformComponentRemover.cpp in the AzToolsFramework source directory. This PR fixes the warnings and the adjacent error that comes from it.

How was this PR tested?

Both an engine and a project were built and compiled successfully on two different machines. Error was not present on either compilations.

[lemonade-dm]

In order to contribute to O3DE, any commits need to be signed off with Developer Certificate of Origin (DCO). The change here fails the DCO signoff and can be mitigated by following the steps on the PR at https://github.com/o3de/o3de/pull/17507/checks?check_run_id=21548228389