Fix Android xml converter tests

plugins/android-compiler-plugin/testData/android/converter/simple/multiFile/layout1.kt

@@ -0,0 +1,18 @@
+package kotlinx.android.synthetic.layout1
+
+import android.app.Activity
+import android.view.View
+import android.widget.*
+
+val Activity.frameLayout: FrameLayout
+    get() = findViewById(0) as FrameLayout
+
+val Activity.passwordField: TextView
+    get() = findViewById(0) as TextView
+
+val Activity.passwordCaption: EditText
+    get() = findViewById(0) as EditText
+
+val Activity.loginButton: Button
+    get() = findViewById(0) as Button
+

plugins/android-compiler-plugin/testData/android/converter/simple/noIds/layout.kt

@@ -1,6 +0,0 @@
-package kotlinx.android.synthetic.layout
-
-import android.app.Activity
-import android.view.View
-import android.widget.*
-