remove unused import

Author: Vladimir Kotal

suggester/src/main/java/org/opengrok/suggest/Suggester.java

@@ -22,7 +22,6 @@
  */
 package org.opengrok.suggest;
 
-import io.micrometer.core.instrument.Counter;
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Timer;
 import org.apache.commons.lang3.time.DurationFormatUtils;