bug: the return type of `molecule.colorTheme.getThemeById` is wrong

[mortalYoung]

Describe the bug

molecule/src/services/theme/colorThemeService.ts

Lines 45 to 49 in 61b1753

	/**
	* Get specific theme via id
	* @param id
	*/
	getThemeById(id: string): void;

The return type of this method is not a void.

Versions

• OS:
• Browser:
• Molecule: 0.9.0-beta.4.2

To reproduce

Expected

Actually happening