Search only starts when typing more than 2 characters

[AlynxZhou]

When searching songs or others, it only starts after you typed 2 or more characters. For English this is not a problem because a word has many characters but for languages like Chinese or Japanese, sometimes you can only remember one character of a song, and Poweramp won't search, which is very inconvenient.

It will be better just start searching when user typed 1 character.