Remove notepadbot, not maintained as part of SQLCipher for Android

Author: developernotes

.gitmodules

@@ -18,7 +18,4 @@
 	url = https://github.com/android/platform_frameworks_base.git
 [submodule "external/icu4c"]
 	path = external/icu4c
-	url = https://github.com/android/platform_external_icu4c.git
-[submodule "notepadbot"]
-	path = dist/SQLCipherForAndroid-SDK/samples/notepadbot
-	url = https://github.com/guardianproject/notepadbot.git
+	url = https://github.com/android/platform_external_icu4c.git