Fix bug discovered by TheRealManiac

Fix the bug discovered by TheRealManiac at https://forum.botengine.org/t/mining-bot-question-and-hints/3140/25?u=viir

As said in the video at https://youtu.be/dgV9Ce7f03I?t=749, the return drones threshold should be higher.

implement/applications/eve-online/eve-online-mining-bot/src/Bot.elm

@@ -1,4 +1,4 @@
-{- EVE Online mining bot version 2020-04-18
+{- EVE Online mining bot version 2020-04-23
 
    The bot warps to an asteroid belt, mines there until the ore hold is full, and then docks at a station to unload the ore. It then repeats this cycle until you stop it.
    It remembers the station in which it was last docked, and docks again at the same station.
@@ -180,7 +180,7 @@ returnDronesAndRunAwayIfHitpointsAreTooLow : BotDecisionContext -> EveOnline.Par
 returnDronesAndRunAwayIfHitpointsAreTooLow context shipUI =
     let
         returnDronesShieldHitpointsThresholdPercent =
-            context.settings.runAwayShieldHitpointsThresholdPercent - 5
+            context.settings.runAwayShieldHitpointsThresholdPercent + 5
 
         runAwayWithDescription =
             DescribeBranch