[index] Simplify debug mode detection
[index] Simplify debug mode detection

This removes superfluous variables and if-statements when checking
whether the debug mode is active or not.

ORelio/rss-bridge,kranack/rss-bridge,sebsauvage/rss-bridge,RSS-Bridge/rss-bridge,Riduidel/rss-bridge,simonbru/rss-bridge,RSS-Bridge/rss-bridge,ORelio/rss-bridge,ORelio/rss-bridge,LogMANOriginal/rss-bridge,Frenzie/rss-bridge,teromene/rss-bridge,Frenzie/rss-bridge,Riduidel/rss-bridge,teromene/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,kranack/rss-bridge,Riduidel/rss-bridge,GregThib/rss-bridge,LogMANOriginal/rss-bridge,simonbru/rss-bridge,kranack/rss-bridge