Update hp_proliant_da_phydrv.py - don't convert disk size to bytes

[countingpine]

Fix size reporting on ProLiant Disks - the value is output with the "MB" unit, and doesn't need converting to bytes.

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General information

In checking a ProLiant iLO disk information, the size is output as MB, e.g.

Bay: 1, Bus number: 0, Status: ok, Smart status: ok, Ref hours: 24564, Size: 600126259200MB, Condition: ok

But this value is suspiciously large.

The size value is specified to be in megabytes (1,048,576), so the unit is correct.
https://oidref.com/1.3.6.1.4.1.232.3.2.5.1.1.45

But it's mistakenly being converted from MiB to bytes before it is output (size=int(size) * 1024**2).

With this fix it outputs the more reasonable value: 572325MB (~558.9 GB):

Bay: 1, Bus number: 0, Status: ok, Smart status: ok, Ref hours: 24565, Size: 572325MB, Condition: ok

Attaching an SNMP Walk for 1.3.6.1.4.1.232.3.2.5.1.1. on the server (with serial numbers truncated.)
snmpwalk_v2c_cpublic_.1.3.6.1.4.1.232.3.2.5.1.1.txt

OMD - Open Monitoring Distribution Version 2.3.0p26.cre
Running on Ubuntu 24.04.1 LTS

Bug reports

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• Your operating system name and version
• Any details about your local setup that might be helpful in troubleshooting
• Detailed steps to reproduce the bug
• An agent output or SNMP walk
• The ID of a submitted crash report for reference (if applicable)

Proposed changes

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[countingpine]

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[countingpine]

Note, I think this is the same change that was proposed in #660 (which wasn't rejected but closed for other reasons).