Fix bad function call during extraction and decryption

[ExhoAR22]

When running with the -X -c flags, an AttributeError is raised due to HeaderFile not having the get_decrypted method.
I believe the intended function is get_decrypted_body. This PR fixes the bad function calls allowing the extraction to complete.

[github-actions]

Metrics

psptool command line interface metrics

Metric	Value
Files Processed	68
Stdout Lines	4,596
Stderr Lines	834
Total Lines	5,430
Error Ratio	15.36%

PSPTool python library metrics

Status	Count	Percentage
✓ Successful	33	48.53%
✗ Failed	35	51.47%
Total	68	100%

Failed Files

• ASUS_ROG-STRIX-X470-F-GAMING-ASUS-4804.CAP
• ASUS_ROG-STRIX-B450-F-GAMING-ASUS-2301.CAP
• ASRock_B450_B45P4_3.31
• TUF-GAMING-A520M-PLUS-WIFI-ASUS-2604.CAP
• Lenovo_Thinkpad_T14_WinGLC3A106.ROM
• ASRock_X470_X47GK4_3.31
• ASUS_ROG-STRIX-B350-F-GAMING-ASUS-4801.CAP
• ASUS_TUF-B450M-PRO-GAMING-ASUS-1201.CAP
• ASUS_PRIME-X470-PRO-4011.CAP
• Gigabyte_X470AG7W.F40
• ASUS_PRIME-X370-PRO-3803.CAP
• ASRock_X370_X370GK45.30
• ASRock-A520M-HSV-1.31.ROM
• MSI_X470_E7B77AMS.194
• ASUS_PRIME-X470-PRO-ASUS-4804.CAP
• ASUS_PRIME-B350-PLUS-4011.CAP
• ASUS_ROG-STRIX-X370-F-GAMING-ASUS-4801.CAP
• ASRock_A320_A32M5.00
• ASRock_B350_AB35G4_5.70
• Gigabyte_AX370G3.F31
• AORUS_X370G5.23d
• ASUS_B450M_KII_Zen1_ROM_Exploit.rom
• AORUS_B450AE.F40
• ASRock_A520M_HVS_1.31.ftpm_with_data.rom
• Gigabyte_WRX80F2
• AORUS_X570_X57AOXT2.FCd
• MSI_X370_E7A33AMS.4I1
• ASUS_PRIME-B450M-A-ASUS-1201.CAP
• MSI_B450_E7B86AMS.181
• Acer_R01-A4.ROM
• AORUS_X470AG7W.F40
• ASUS_PRIME-A320M-A-ASUS-4801.CAP
• MSI_A320_E7A38AMS.2I2
• Lenovo_Ideapad_5_Pro-16ACH6.rom
• MSI_B350_E7A34AMS.1O1

[cwerling]

Thanks!