Eliminate unused import of ZipException (flutter#7429)

Use of this class was eliminated in flutter/engine#7398.

Author: cbracken

shell/platform/android/io/flutter/view/ResourceExtractor.java

@@ -23,7 +23,6 @@
 import java.util.concurrent.ExecutionException;
 import java.util.zip.CRC32;
 import java.util.zip.ZipEntry;
-import java.util.zip.ZipException;
 import java.util.zip.ZipFile;
 
 /**