Fix import asset doesn't use the asset name by default

[adriengivry]

Description

When importing an asset on Linux, after selecting it, we're being asked for a location where to save it. However, we need to manually type a name for it.

To Reproduce

Steps to reproduce the behavior:

1. Open OvEditor
2. In the Asset Browser, click "Import Asset"
3. Select an asset to import (e.g. FBX, OBJ, PNG...)
4. Validate
5. Notice that the save window asks for a name for the asset.

Expected behavior

By default, the initial name of the asset should be kept in the save window.

Screenshots

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