Bug #1060: Fix incorrect spell type checks

apps/openmw/mwmechanics/spells.cpp

@@ -125,7 +125,7 @@ namespace MWMechanics
             const ESM::Spell *spell =
                 MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().find (iter->first);
 
-            if (spell->mData.mType & ESM::Spell::ST_Disease)
+            if (spell->mData.mType == ESM::Spell::ST_Disease)
                 mSpells.erase(iter++);
             else
                 iter++;
@@ -139,7 +139,7 @@ namespace MWMechanics
             const ESM::Spell *spell =
                 MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().find (iter->first);
 
-            if (spell->mData.mType & ESM::Spell::ST_Blight)
+            if (spell->mData.mType == ESM::Spell::ST_Blight)
                 mSpells.erase(iter++);
             else
                 iter++;

apps/openmw/mwworld/worldimp.cpp

@@ -2072,7 +2072,7 @@ namespace MWWorld
             }
 
             // If this is a power, check if it was already used in the last 24h
-            if (!fail && spell->mData.mType & ESM::Spell::ST_Power)
+            if (!fail && spell->mData.mType == ESM::Spell::ST_Power)
             {
                 if (stats.canUsePower(spell->mId))
                     stats.usePower(spell->mId);