ShellPkg: TAB logic incorrectly chops out fs0: when typing fs0:<TAB>
ShellPkg: TAB logic incorrectly chops out fs0: when typing fs0:<TAB>

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <9fa3a6894a36bca79e6a72ad65af5a5702efecd1@intel.com>
Reviewed-by: Jaben Carsey <2d4ee76b36e91bee3a58378b7538904eb027a616@intel.com>
Reviewed-by: Tapan Shah <cd82a97b31196a8aa18362807101a3afc161327b@hpe.com>

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