VmTerminalApp: Increase estimated image size to 550MB

As of today, actual size was about 537MB

Bug: N/A
Change-Id: I394055700984a9cfa3bede4d34cc469a7556de3e
Test: Manually
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.java b/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.java
index 83c6b4c..8ea095a 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.java
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.java
@@ -46,7 +46,7 @@
 public class InstallerActivity extends BaseActivity {
     private static final String TAG = "LinuxInstaller";
 
-    private static final long ESTIMATED_IMG_SIZE_BYTES = FileUtils.parseSize("350MB");
+    private static final long ESTIMATED_IMG_SIZE_BYTES = FileUtils.parseSize("550MB");
 
     private ExecutorService mExecutorService;
     private CheckBox mWaitForWifiCheckbox;