Turn the optimization on for the terminal app

... but

* bytecode optimization
* pruning of unused classes and members (they are used by tests)

Bug: 375051310
Bug: 377100096
Test: atest TerminalAppTests

Change-Id: Iad31eabce7f5c7511320974ee0d1bc862dc14f06
diff --git a/android/TerminalApp/proguard.flags b/android/TerminalApp/proguard.flags
index b93240c..8433e82 100644
--- a/android/TerminalApp/proguard.flags
+++ b/android/TerminalApp/proguard.flags
@@ -30,4 +30,4 @@
 -keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
 -keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
 
-##---------------End: proguard configuration for Gson  ----------
\ No newline at end of file
+##---------------End: proguard configuration for Gson  ----------