Increase default font size to 13.

Because ttyd's default font size is 13

Bug: 370371055
Change-Id: I203bc123311d0d5e6758b67fda88f65ca02f2a82
Test: Manually
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
index 4e32de7..ebf6154 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
@@ -80,7 +80,7 @@
     private static final String VM_ADDR = "192.168.0.2";
     private static final int TTYD_PORT = 7681;
     private static final int REQUEST_CODE_INSTALLER = 0x33;
-    private static final int FONT_SIZE_DEFAULT = 12;
+    private static final int FONT_SIZE_DEFAULT = 13;
 
     private X509Certificate[] mCertificates;
     private PrivateKey mPrivateKey;