Fix WordPress Embedded Block Shows Large Whitespace for Short Posts

[devansh016]

Fix embed block height calculation by setting minimum height for iframe as 100px.

Issue: On frontend if we have WordPress Embedded block with a post that has less content WordPress Embedded block has large whitespace at the bottom.

Solution: Sets minimum height of iframe as 100px.
The embedded iframe height was around 139px, and on mobile (320px width) it was about 161px for short post.
Since, it was less than 200px the iframe was using 200px as height and hence the whitespace.

A minimum height of 100px seems reasonable.

Trac ticket: https://core.trac.wordpress.org/ticket/62934

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