626: provide encapsulation for MainPage field

kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/pages/MainPage.java

@@ -12,7 +12,7 @@ public class MainPage {
 
   private static final long TIMEOUT = 25000;
 
-  public static final String path = "";
+  protected static final String path = "";
 
   @Step
   public MainPage isOnPage() {