change some style

diff --git a/oUF_RaidDebuffs.lua b/oUF_RaidDebuffs.lua
index 953e929..1971725 100644
--- a/oUF_RaidDebuffs.lua
+++ b/oUF_RaidDebuffs.lua
@@ -66,7 +66,7 @@ local DispelFilter = ({
     },
 })[select(2, UnitClass'player')]

-local function formatTime(s)
+local formatTime = function(s)
     if s > 60 then
         return format('%dm', s/60), s%60
     else