Fixed "Delete all unused declarations" to delete self-referential functions

[Andarist]

fixes #57498

[Andarist]

this just follows the pattern used by the single-codefix "branch" here:

TypeScript/src/services/codefixes/fixUnusedIdentifier.ts

Lines 127 to 135 in 39b3aa0

	if (canDeleteEntireVariableStatement(sourceFile, token)) {
	return [
	createDeleteFix(textChanges.ChangeTracker.with(context, t => deleteEntireVariableStatement(t, sourceFile, token.parent as VariableDeclarationList)), Diagnostics.Remove_variable_statement),
	];
	}
	if (isIdentifier(token) && isFunctionDeclaration(token.parent)) {
	return [createDeleteFix(textChanges.ChangeTracker.with(context, t => deleteFunctionLikeDeclaration(t, sourceFile, token.parent as FunctionLikeDeclaration)), [Diagnostics.Remove_unused_declaration_for_Colon_0, token.getText(sourceFile)])];
	}