Fix librustdoc search events
Fix librustdoc search events

Previously only keyup event was looked at, which meant that pasting, cutting and
otherwise changing the input without typing would not catch any updates to the
search query.

GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust