Resolve issue #1497 (DesktopAssetManager is a misnomer)#1506

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Ali-RS wants to merge 1 commit intojMonkeyEngine:masterfrom

Ali-RS:fix-assetmanager

Commits on Apr 4, 2021

Renamed DesktopAssetManager to DefaultAssetManager as it was a misnomer. It’s included in jme3-core and used both on desktop and mobile platforms.
Ali-RS
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