[Calc] typechecking improvements

[Evanroby]

fixes this Pylance typechecking error:

[{
	"resource": "/c:/Users/Cedric/Desktop/cogs/Vex-Cogs/calc/calc.py",
	"owner": "Pylance",
	"code": {
		"value": "reportIncompatibleMethodOverride",
		"target": {
			"$mid": 1,
			"path": "/microsoft/pylance-release/blob/main/docs/diagnostics/reportIncompatibleMethodOverride.md",
			"scheme": "https",
			"authority": "github.com"
		}
	},
	"severity": 8,
	"message": "Method \"red_delete_data_for_user\" overrides class \"CogMixin\" in an incompatible manner\n  Return type mismatch: base method returns type \"CoroutineType[Any, Any, NoReturn]\", override returns type \"CoroutineType[Any, Any, None]\"\n    \"CoroutineType[Any, Any, None]\" is not assignable to \"CoroutineType[Any, Any, NoReturn]\"\n      Type parameter \"_ReturnT_nd_co@CoroutineType\" is covariant, but \"None\" is not a subtype of \"NoReturn\"\n        Type \"None\" is not assignable to type \"NoReturn\"",
	"source": "Pylance",
	"startLineNumber": 38,
	"startColumn": 15,
	"endLineNumber": 38,
	"endColumn": 39,
	"relatedInformation": [
		{
			"startLineNumber": 886,
			"startColumn": 15,
			"endLineNumber": 886,
			"endColumn": 39,
			"message": "Overridden method",
			"resource": "/c:/Users/Cedric/AppData/Local/Programs/Python/Python311/Lib/site-packages/redbot/core/commands/commands.py"
		}
	],
	"origin": "extHost1"
}]

and reformats a bit using Ruff.

[Vexed01]

Looks good, thank you!