Allow memory and storage size value to be cleared entirely

[ericswpark]

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Pretty sure this issue hasn't been reported (did search for it but didn't find anything) but feel free to close it if it is! Let me know the existing issue number so I can follow it.

Describe the issue

When creating a new VM, the "Memory" option does not allow the value to be cleared entirely. So for example, if a user wants to change the default value of 4096 MB to 2048 MB, they would use the backspace key to clear away 4096 -> 409 -> 40 -> 4. However, the last digit will not be cleared, probably to prevent invalid values. However. this means that when the user keys in 2048, the final entered value ends up being 42048, which might exceed the Mac's available RAM. In this case, UTM (helpfully) resets the value back to the maximum RAM value installed in the system, but it is a bit annoying.

The invalid RAM value check should be done when the user clicks on the "Continue" button instead.

A similar issue exists for the "Storage" section. The storage value cannot be cleared away entirely for a new value.

Configuration

• UTM Version: 4.4.4 (92)
• macOS Version: Sonoma 14.1.1
• Mac Chip (Intel, M1, ...): Intel