Changes for handling image in button and fixes in Dt-Modal

[Vijenderrr]

@micahmills We have made changes for dt-modal in:

• dt-modal.js (src\components\layout\dt-modal\dt-modal.js)
• dt-modal.stories.js (src\components\layout\dt-modal\dt-modal.stories.js)

to handle the image in modal button and fixes in design.

Kindly look in the changes and provide us with your feedback. Thanks!

@Ashima-Arora @gp-birender

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