Prevent jumping of search button

[sarthaknagoshe2002]

Fixes: #52854

What?

When the search box has change button position set to button only and is aligned to the right while having blocks to it left, the search button jumps, highlighted in #52854.
This PR fixes this jumping of search button when the search box expands.

How?

Removed flex-basis property from the input box which was making the button jump.

Testing Instructions

1. Add/edit existing post.
2. Add a row.
3. Add some blocks on the left side of the row.
4. Add the search block to the right.
5. Set change button position to button only.
6. On the frontend the search button should no longer jump while expanding the search box.

Screenshots or screencast

Before

Screen.Recording.2024-11-12.at.5.30.57.PM.mov

After

Screen.Recording.2024-11-12.at.5.31.25.PM.mov

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Co-authored-by: sarthaknagoshe2002 <[email protected]>
Co-authored-by: skorasaurus <[email protected]>
Co-authored-by: hanneslsm <[email protected]>

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