Android: drop const from AndroidConfigurations::currentConfig()

Since the config can be expected to modify configuration values
(e.g. setEmulatorArgs()) it shouldn't be const, but can be set
to const whenever creating a reference that is not meant for
modifying the config.

Change-Id: I8c816a5422d4d57afa158c723d908e3a9a9a0db8
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/android/androidqmlpreviewworker.h

@@ -78,7 +78,7 @@ private:
     Utils::FilePath createQmlrcFile(const Utils::FilePath &workFolder, const QString &basename);
 
     ProjectExplorer::RunControl *m_rc = nullptr;
-    AndroidConfig m_androidConfig;
+    const AndroidConfig &m_androidConfig;
     QString m_serialNumber;
     QStringList m_avdAbis;
     int m_viewerPid = -1;