[BFN] Fix 'show platform psustatus' command

[bratashX]

Why I did it

SONiC CLI command was broken.

admin@sonic:~$ show  platform psustatus 
PSU    Model                        Serial    HW Rev  Voltage (V)    Current (A)      Power (W)  Status    LED
-----  ---------------  ------------------  --------  -------------  -------------  -----------  --------  -----
PSU 1  PFE600-12-054NA  420000956420600006       206  N/A            N/A                  82.00  OK        green
PSU 2  PFE600-12-054NA  420000956420600248       206  N/A            N/A                  60.00  NOT OK    green

How I did it

Fix Python string formating.

How to verify it

Run show platform psustatus

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

Signed-off-by: Petro Bratash [email protected]