Fix typo in parseint.untouched_on_failure test

This test means to check both that ParseInt() and ParseUint() do not
change the result on failure, however it erroneously tested ParseInt()
twice.

Test: unit tests
Change-Id: If534e2525827e19aba6cae0eef45668d57623efb
diff --git a/parseint_test.cpp b/parseint_test.cpp
index 4afa32e..b8cf654 100644
--- a/parseint_test.cpp
+++ b/parseint_test.cpp
@@ -121,7 +121,7 @@
   ASSERT_EQ(123, i);
 
   unsigned int u = 123u;
-  ASSERT_FALSE(android::base::ParseInt("456x", &u));
+  ASSERT_FALSE(android::base::ParseUint("456x", &u));
   ASSERT_EQ(123u, u);
 }