FEAT(client): Clear local mutes on Mumble restart

Previously, local muted users would be muted persistently basically
forever. This meant that local muting a client could end up being
confusing down the line (e.g days later) when the user forgot that
they muted someone.
As a means of self-moderation though, local mutes should also not
expire when the muted client reconnects or something similar.

This commit clears the all local mutes in the client when Mumble
starts.

Fixes mumble-voip#5983

src/mumble/Database.cpp

@@ -399,6 +399,12 @@ void Database::setLocalMuted(const QString &hash, bool muted) {
 	execQueryAndLogFailure(query);
 }
 
+void Database::clearLocalMuted() {
+	QSqlQuery query(db);
+	query.prepare(QLatin1String("DELETE FROM `muted`"));
+	execQueryAndLogFailure(query);
+}
+
 ChannelFilterMode Database::getChannelFilterMode(const QByteArray &server_cert_digest, const unsigned int channel_id) {
 	QSqlQuery query(db);
 

src/mumble/Database.h

@@ -48,6 +48,7 @@ class Database : public QObject {
 
 	bool isLocalMuted(const QString &hash);
 	void setLocalMuted(const QString &hash, bool muted);
+	void clearLocalMuted();
 
 	float getUserLocalVolume(const QString &hash);
 	void setUserLocalVolume(const QString &hash, float volume);

src/mumble/main.cpp

@@ -658,6 +658,7 @@ int main(int argc, char **argv) {
 
 	// Initialize database
 	Global::get().db = new Database(QLatin1String("main"));
+	Global::get().db->clearLocalMuted();
 
 #ifdef USE_ZEROCONF
 	// Initialize zeroconf