Fix header create new button vertical alignment
What does this MR do and why?
The Create New button in the header is not aligned properly with the rest of the buttons, and sits 1 pixel higher than the buttons to the right of it:
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This MR fixes the alignment:
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Describe in detail what your merge request does and why.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #378693 (closed)