db/Pad: reversed condition to make core logic evident. No functional changes
db/Pad: reversed condition to make core logic evident. No functional changes

Here it was legal to replace a lax comparison with a strict one, since we are
using indexOf(), whose return value is known.

lpagliari/etherpad-lite,joequant/etherpad-lite,storytouch/etherpad-lite,lpagliari/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,University-of-Potsdam-MM/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,ether/etherpad-lite,aptivate/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,storytouch/etherpad-lite,aptivate/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,lpagliari/etherpad-lite,aptivate/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,University-of-Potsdam-MM/etherpad-lite,joequant/etherpad-lite,lpagliari/etherpad-lite,University-of-Potsdam-MM/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,University-of-Potsdam-MM/etherpad-lite