Amiga core creates unnecessary SRAM file in saves

[rhester72]

Describe the bug
Every launch of a new title with the Amiga core creates a corresponding .srm file in /media//saves/commodore_ami that appears to have no purpose. This is NOT a regression - it occurred in v1.6.x as well but I didn't notice because so many other additional files were being created.

To Reproduce
Steps to reproduce the behavior:

1. Start a game in the Amiga core (e.g. Populous.adf)
2. Observe the creation of a corresponding 0-byte SRAM file in the saves directory (e.g. /media//saves/commodore_ami/Populous.srm)

Expected behavior
No SRAM save file should be created (unless there's a purpose I'm missing)

Setup:

• Device: Raspberry Pi 500
• OS version: v1.7.0
• Storage: USB
• Power adapter: Raspberry Pi official