Fix typo in AAPT2 error message

AAPT2 - and 1 - print "String pool is unitialized."
I found this out when I saw the error and tried to look for it in Code Search only to get no results because it's spelled wrong.

Change-Id: I66e2dcada0b1441d9f21aebded1ef95af09e7ac1
Flag: EXEMPT log only update
diff --git a/tools/aapt2/Debug.cpp b/tools/aapt2/Debug.cpp
index 064b461..2527dcd 100644
--- a/tools/aapt2/Debug.cpp
+++ b/tools/aapt2/Debug.cpp
@@ -445,7 +445,7 @@
   using namespace android;
 
   if (pool->getError() == NO_INIT) {
-    printer->Print("String pool is unitialized.\n");
+    printer->Print("String pool is uninitialized.\n");
     return;
   } else if (pool->getError() != NO_ERROR) {
     printer->Print("String pool is corrupt/invalid.\n");