Fix start logging

src/com/owncloud/android/MainApp.java

@@ -26,6 +26,7 @@ import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.os.Environment;
 
 import com.owncloud.android.authentication.PassCodeManager;
 import com.owncloud.android.datamodel.ThumbnailsCacheManager;
@@ -79,7 +80,8 @@ public class MainApp extends Application {
             // Set folder for store logs
             Log_OC.setLogDataFolder(dataFolder);
 
-            Log_OC.startLogging();
+            //TODO: to be changed/fixed whenever SD card support gets merged.
+            Log_OC.startLogging(Environment.getExternalStorageDirectory().getAbsolutePath());
             Log_OC.d("Debug", "start logging");
         }