Restore the background color to the original shade

[carterworks]

Description

Before the update to @spectrum-css/tokens in #459 (not our actual change, just a representation of the color tokens)

.react-spectrum-provider {
  --spectrum-gray-100: rgb(248, 248, 248);
  background-color: var(--spectrum-gray-100);
}

Before this PR

.react-spectrum-provider {
  --spectrum-gray-100: rgb(233, 233, 233);
  background-color: var(--spectrum-gray-100);
}

After this PR:

.react-spectrum-provider {
  --spectrum-gray-50: rgb(248, 248, 248);
  background-color: var(--spectrum-gray-50);
}

Related Issue

Motivation and Context

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change which does not add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA or I'm an Adobe employee.
• I have made any necessary test changes and all tests pass.
• I have run the Sandbox successfully.
• I've updated the schema in extension.json or no changes are necessary.
• My change requires a change to the documentation.