Call unregisterCommand instead of registerCommand (#4596)

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

bundles/org.openhab.core.io.console.karaf/src/main/java/org/openhab/core/io/console/karaf/internal/ConsoleSupportKaraf.java

@@ -100,7 +100,7 @@ public class ConsoleSupportKaraf {
      */
     private void unregisterCommands() {
         for (final ConsoleCommandExtension command : commands) {
-            registerCommand(command);
+            unregisterCommand(command);
         }
     }