scanner: blacklist Bugly

The artifact is licensed under "The Bugly Software License, Version 1.0"
[1], but link to the full text [2] is broken. LICENSE file in the source
code repository is empty.

I guess this library is non-free.

[1] https://mvnrepository.com/artifact/com.tencent.bugly/crashreport/2.8.6.0
[2] http://bugly.qq.com/licenses/LICENSE-1.0.txt
[3] https://github.com/BuglyDevTeam/Bugly-Android

fdroidserver/scanner.py

@@ -77,6 +77,7 @@ def scan_source(build_dir, build=metadata.Build()):
             r'firebase',
             r'''["']com.facebook.android['":]''',
             r'cloudrail',
+            r'com.tencent.bugly',
         ]
     }