add Daiki to code owner in PWGEM (#4099)

Author: dsekihat

CODEOWNERS

@@ -29,7 +29,7 @@
 /PWGDQ @alibuild @iarsene @dsekihat @feisenhu @lucamicheletti93
 /PWGEM @alibuild @mikesas @rbailhac @feisenhu
 /PWGEM/Dilepton @alibuild @mikesas @rbailhac @dsekihat @ivorobye @feisenhu
-/PWGEM/PhotonMeson @alibuild @mikesas @rbailhac @m-c-danisch @novitzky @mhemmer-cern
+/PWGEM/PhotonMeson @alibuild @mikesas @rbailhac @m-c-danisch @novitzky @mhemmer-cern @dsekihat
 /PWGHF @alibuild @vkucera @fcolamar @fgrosa @fcatalan92 @mfaggin @mmazzilli @deepathoms @nzardosh @NicoleBastid
 /PWGLF @alibuild @lramona @alcaliva @lbariogl @chiarapinto @BongHwi @lbarnby @mbombara @iravasen @njacazio @ChiaraDeMartin95 @skundu692
 /PWGMM @alibuild @aalkin