Revert "Add "thanks" and "thank you" to "pray" emoji (#24090)" (#24969)

This reverts commit 6abaf04a95.

server/public/model/emoji_data.go

@@ -223,9 +223,6 @@ var SystemEmojis = map[string]string{
 	"palms_up_together":                 "1f932",
 	"handshake":                         "1f91d",
 	"pray":                              "1f64f",
-	"thanks":                            "1f64f",
-	"thank you":                         "1f64f",
-	"thank_you":                         "1f64f",
 	"writing_hand":                      "270d-fe0f",
 	"nail_care":                         "1f485",
 	"selfie":                            "1f933",