Fix UI tests (#3008)

Author: rli

ui-tests/tst/software/aws/toolkits/jetbrains/uitests/fixtures/Preferences.kt

@@ -32,7 +32,7 @@ open class PreferencesDialog(
     remoteComponent: RemoteComponent
 ) : DialogFixture(remoteRobot, remoteComponent) {
     fun search(query: String) = step("Search $query") {
-        textField(byXpath("//div[@class='TextFieldWithProcessing']")).text = query
+        textField(byXpath("//div[@class='SettingsSearch']//div[@class='TextFieldWithProcessing']")).text = query
     }
 
     fun selectPreferencePage(vararg crumbs: String) {

ui-tests/tst/software/aws/toolkits/jetbrains/uitests/tests/SamRunConfigTest.kt

@@ -97,7 +97,7 @@ class SamRunConfigTest {
                         find<JListFixture>(byXpath("//div[@class='MyList']")).clickItem("Edit Configurations...")
                     }
                     addRunConfig()
-                    find<ComboBoxFixture>(byXpath("//div[@text='Runtime:']/following-sibling::div[@class='ComboBox']")).selectItem("java11")
+                    find<ComboBoxFixture>(byXpath("(//div[@text='Runtime:']/following-sibling::div[@class='ComboBox'])[1]")).selectItem("java11")
                     findAndClick("//div[@class='HandlerPanel']")
                     keyboard { enterText("helloworld.App::handleRequest") }
                     findAndClick("//div[@class='MyEditorTextField']")