[TASK] Avoid duplicate DragUploader initialization

The DragUploader module initializes itself by calling
initialize() as last execution step, therefore the
function does not need to be called a second time.

Releases: main, 11.5
Resolves: #96566
Related: #96323
Change-Id: I5a91abb2d12f56fc955266c1723c98ffa024fc6f
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