[Firebase][Core][CloudFirestore] Fixed a typo in Cloud Firestore icon

* Updated Podfile.lock of F.Core

Firebase.Core/externals/Podfile.lock

@@ -35,6 +35,7 @@ PODS:
   - GTMSessionFetcher/Core (1.1.12)
   - GTMSessionFetcher/Full (1.1.12):
     - GTMSessionFetcher/Core (= 1.1.12)
+  - leveldb-library (1.18.3)
   - nanopb (0.3.8):
     - nanopb/decode (= 0.3.8)
     - nanopb/encode (= 0.3.8)
@@ -50,6 +51,7 @@ DEPENDENCIES:
   - GoogleToolboxForMac/StringEncoding (= 2.1.3)
   - GoogleToolboxForMac/URLBuilder (= 2.1.3)
   - GTMSessionFetcher/Full (= 1.1.12)
+  - leveldb-library (= 1.18.3)
   - nanopb (= 0.3.8)
   - Protobuf (= 3.4.0)
 
@@ -60,9 +62,10 @@ SPEC CHECKSUMS:
   FirebaseInstanceID: d2058a35e9bebda1b6dd42486b84917bde552a9d
   GoogleToolboxForMac: 2501e2ad72a52eb3dfe7bd9aee7dad11b858bd20
   GTMSessionFetcher: ebaa1f79a5366922c1735f1566901f50beba23b7
+  leveldb-library: 10fb39c39e243db4af1828441162405bbcec1404
   nanopb: 5601e6bca2dbf1ed831b519092ec110f66982ca3
   Protobuf: 03eef2ee0b674770735cf79d9c4d3659cf6908e8
 
-PODFILE CHECKSUM: c5b16eb4715696c45fd0692bc934550d4e8b36d4
+PODFILE CHECKSUM: af32f485cb47f3144e353258a0aac2c48a50dc04
 
 COCOAPODS: 1.4.0