helpers: Slight improvement of ToLowerMap

See #2581

helpers/general.go

@@ -137,9 +137,10 @@ func ToLowerMap(m map[string]interface{}) {
 		lKey := strings.ToLower(k)
 		if k != lKey {
 			delete(m, k)
-		}
 			m[lKey] = v
 		}
+
+	}
 }
 
 // ReaderToString is the same as ReaderToBytes, but returns a string.