filter icons are affected by zk-bootstrap addon

Steps to Reproduce

1. run keikai with zk-bootstrap

		<dependency>
			<groupId>org.zkoss.addons</groupId>
			<artifactId>zk-bootstrap</artifactId>
			<version>1.0.0</version>
		</dependency>

2. import the file in KEIKAI-229

Current Result

icons are out of the dialog

Expected Result

icon positions are not affected

Debug Information

Since zk-bootstrap is an old, deprecated addon, please don't solve this bug with a specific implementation for zk-bootstrap. Please apply a solution for a general case. If we have to apply a specific solution, consider to provide a workaround.