Prevent search table header controls from overflowing onto new line

[nicwells]

Fixes BlueBrain/nexus#2931

Description

Prevent search header options and pagination overflowing onto new line and looking weird when browser window width reduced such that there isn't enough room for all controls.

How has this been tested?

Tested in Chrome

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added necessary unit and integration tests.
• I have added screenshots (if applicable), in the comment section.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.7.0-M1@fbd4bac). Click here to learn what that means.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             1.7.0-M1     #987   +/-   ##
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  Coverage            ?   67.07%           
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  Files               ?       21           
  Lines               ?      568           
  Branches            ?      126           
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  Hits                ?      381           
  Misses              ?      187           
  Partials            ?        0           

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