Another possibility would be to use Unite Extension which fixes this issue and provides many other improvements for the Unity-lovers.
Unite is a GNOME Shell extension which makes a few layout tweaks to the top panel and removes window decorations to make it look like Ubuntu Unity Shell.
As suggested by @pLumo, 'Status Area Horizontal Spacing' GNOME extension fixed my problem.
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Another possibility would be to use Unite Extension which fixes this issue and provides many other improvements for the Unity-lovers.