Always update vm_config.json

to prevent from not updating the file
it's okay because the file is tiny

Bug: 346676738
Test: run the app with old vm_config.sjon
Change-Id: I28d69766e91598680f7acc3e0719e3799abcb600
diff --git a/ferrochrome_app/java/com/android/virtualization/ferrochrome/FerrochromeActivity.java b/ferrochrome_app/java/com/android/virtualization/ferrochrome/FerrochromeActivity.java
index 71a9ff8..d4365a7 100644
--- a/ferrochrome_app/java/com/android/virtualization/ferrochrome/FerrochromeActivity.java
+++ b/ferrochrome_app/java/com/android/virtualization/ferrochrome/FerrochromeActivity.java
@@ -129,9 +129,6 @@
     }
 
     private void copyVmConfigJson() {
-        if (Files.exists(VM_CONFIG_PATH)) {
-            return;
-        }
         try (InputStream is = getResources().openRawResource(R.raw.vm_config)) {
             Files.copy(is, VM_CONFIG_PATH, StandardCopyOption.REPLACE_EXISTING);
         } catch (IOException e) {