fix checkstyle error

Author: Kappaccinoh

src/main/java/seedu/address/logic/commands/EditCommand.java

@@ -5,7 +5,6 @@
 import static seedu.address.logic.parser.CliSyntax.PREFIX_NAME;
 import static seedu.address.logic.parser.CliSyntax.PREFIX_NRIC;
 import static seedu.address.logic.parser.CliSyntax.PREFIX_PHONE;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_TAG;
 import static seedu.address.model.Model.PREDICATE_SHOW_ALL_APPOINTMENTS;
 import static seedu.address.model.Model.PREDICATE_SHOW_ALL_PERSONS;