test: Remove ContextAware interface methods from EmptyWebDriver

Author: valfirst

src/test/java/io/appium/java_client/events/stubs/EmptyWebDriver.java

@@ -46,18 +46,6 @@ private static List<StubWebElement> createStubList() {
         return List.of(new StubWebElement(), new StubWebElement());
     }
 
-    public WebDriver context(String name) {
-        return null;
-    }
-
-    public Set<String> getContextHandles() {
-        return null;
-    }
-
-    public String getContext() {
-        return "";
-    }
-
     public void get(String url) {
     }