PAINTROID-545 Zooming while cursor tool is down deletes the already drawn line

[bakicelebi]

PAINTROID-545

Fixed the bug, zooming while drawing with cursor does not delete the already drawn line anymore

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Rereviewing

[Lenkomotive]

The same bug exists in the LineTool as well. Please check this out too.

[bakicelebi]

@Lenkomotive fixed 👍

[SebastianGrief]

LGTM 👍