Fix #1207 by correcting the typing introduced by #1181 (#1208)

* Fix #1207 by correcting the typing introduced by #1181
* Run ./scripts/run_no_prep_tests.sh

Author: seratch

json-logs/samples/api/chat.postMessage.json

@@ -32,7 +32,7 @@
       "lines_more": 12345,
       "preview_is_truncated": false,
       "channels": [
-        "G00000000",
+        "C00000000",
         ""
       ],
       "groups": [
@@ -52,10 +52,14 @@
       "original_w": 12345,
       "original_h": 12345,
       "thumb_tiny": "",
-      "alt_txt": "",
       "thumb_480": "https://www.example.com/",
       "thumb_480_w": 12345,
       "thumb_480_h": 12345,
+      "thumb_360_gif": "https://www.example.com/",
+      "thumb_480_gif": "https://www.example.com/",
+      "deanimate": "https://www.example.com/",
+      "deanimate_gif": "https://www.example.com/",
+      "alt_txt": "",
       "thumb_720": "https://www.example.com/",
       "thumb_720_w": 12345,
       "thumb_720_h": 12345,
@@ -68,10 +72,6 @@
       "thumb_1024": "https://www.example.com/",
       "thumb_1024_w": 12345,
       "thumb_1024_h": 12345,
-      "thumb_360_gif": "https://www.example.com/",
-      "thumb_480_gif": "https://www.example.com/",
-      "deanimate": "https://www.example.com/",
-      "deanimate_gif": "https://www.example.com/",
       "subject": "",
       "source_team": "",
       "non_owner_editable": false,