Update Staging KBS values.

app/build.gradle

@@ -342,7 +342,7 @@ android {
             buildConfigField "String", "SIGNAL_KEY_BACKUP_URL", "\"https://api-staging.backup.signal.org\""
             buildConfigField "String", "CDS_MRENCLAVE", "\"c98e00a4e3ff977a56afefe7362a27e4961e4f19e211febfbb19b897e6b80b15\""
             buildConfigField "KbsEnclave", "KBS_ENCLAVE", "new KbsEnclave(\"823a3b2c037ff0cbe305cc48928cfcc97c9ed4a8ca6d49af6f7d6981fb60a4e9\", " +
-                                                                         "\"51a56084c0b21c6b8f62b1bc792ec9bedac4c7c3964bb08ddcab868158c09982\", " +
+                                                                         "\"16b94ac6d2b7f7b9d72928f36d798dbb35ed32e7bb14c42b4301ad0344b46f29\", " +
                                                                          "\"a3baab19ef6ce6f34ab9ebb25ba722725ae44a8872dc0ff08ad6d83a9489de87\")"
             buildConfigField "KbsEnclave[]", "KBS_FALLBACKS", "new KbsEnclave[0]"
             buildConfigField "String", "UNIDENTIFIED_SENDER_TRUST_ROOT", "\"BbqY1DzohE4NUZoVF+L18oUPrK3kILllLEJh2UnPSsEx\""