Remove all mentions of Flattr

tests/metadata/dump/app.with.special.build.params.yaml

@@ -345,7 +345,6 @@ Description: 'To configure, go to "Settings => Accounts & Sync => Add Account".
   Appbrain SDK was removed before building.'
 Disabled: null
 Donate: null
-FlattrID: null
 IssueTracker: https://github.com/loadrunner/Facebook-Contact-Sync/issues
 Liberapay: null
 License: GPL-3.0-only

tests/metadata/dump/com.politedroid.yaml

@@ -170,7 +170,6 @@ CurrentVersionCode: 6
 Description: Activates silent mode during calendar events.
 Disabled: null
 Donate: null
-FlattrID: null
 IssueTracker: https://github.com/miguelvps/PoliteDroid/issues
 Liberapay: null
 License: GPL-3.0-only

tests/metadata/dump/org.adaway.yaml

@@ -1113,7 +1113,6 @@ Description: 'An ad blocker that uses the hosts file. The hosts file
   read-only.'
 Disabled: null
 Donate: http://sufficientlysecure.org/index.php/adaway
-FlattrID: '369138'
 IssueTracker: https://github.com/dschuermann/ad-away/issues
 Liberapay: null
 License: GPL-3.0-only

tests/metadata/dump/org.smssecure.smssecure.yaml

@@ -383,7 +383,6 @@ Description: 'SMSSecure is an SMS/MMS application that allows you to protect you
   security by auditing the code.'
 Disabled: null
 Donate: null
-FlattrID: null
 IssueTracker: https://github.com/SMSSecure/SMSSecure/issues
 Liberapay: null
 License: GPL-3.0-only

tests/metadata/dump/org.videolan.vlc.yaml

@@ -2604,7 +2604,6 @@ Description: 'Video and audio player that supports a wide range of formats,
   '
 Disabled: null
 Donate: http://www.videolan.org/contribute.html#money
-FlattrID: null
 IssueTracker: http://www.videolan.org/support/index.html#bugs
 Liberapay: null
 License: GPL-3.0-only