cherry-pick TIKA-4381 -- fix import

Author: tballison

tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/libpst/TestLibPstParser.java

@@ -29,7 +29,6 @@
 import org.apache.tika.metadata.MAPI;
 import org.apache.tika.metadata.Message;
 import org.apache.tika.metadata.Metadata;
-import org.apache.tika.metadata.Office;
 import org.apache.tika.metadata.PST;
 import org.apache.tika.metadata.TikaCoreProperties;
 import org.apache.tika.parser.AutoDetectParser;