test: update integration test

Update the integration test because insert mode now defaults to true (#17)

Author: javier-godoy

src/test/java/com/flowingcode/vaadin/addons/xterm/integration/ConsoleFeatureIT.java

@@ -64,11 +64,14 @@ public void testFeature() throws InterruptedException {
     assertThat(cursorPosition(term), is(at(0, y)));
 
     input.sendKeys("A");
-    assertThat(currentLine(term), is("ALL"));
+    assertThat(currentLine(term), is("AELL"));
 
     input.sendKeys(Keys.INSERT, "B");
     assertThat(currentLine(term), is("ABLL"));
 
+    input.sendKeys(Keys.INSERT, "C");
+    assertThat(currentLine(term), is("ABCLL"));
+
     // long line
 
     int cols = getColumnWidth(term);