use android.R.id as the original code does in InstallerActivity

Bug: 383243644
Test: install with prebuilt images.tar.gz, and check the snackbar
Change-Id: I4fef831d70a5aec143ae5d6219924c58f16716e9
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.kt b/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.kt
index 3eff09b..99c64f7 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.kt
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/InstallerActivity.kt
@@ -130,7 +130,7 @@
     }
 
     private fun showSnackBar(message: String, length: Int) {
-        val snackBar = Snackbar.make(findViewById<View>(R.id.content), message, length)
+        val snackBar = Snackbar.make(findViewById<View>(android.R.id.content), message, length)
         snackBar.anchorView = waitForWifiCheckbox
         snackBar.show()
     }