[remoting][Android] Fix broken app version code

The CRD Android app version code had been fallback to "1" in official
build for some reason. This CL explicitly sets the version code to
`chrome_version_code` to be consistent with what we had been using.

Bug: 976461
Change-Id: Id801c01da274eb307dcc316d4e76dd18d391b686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666129
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Auto-Submit: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670258}

remoting/android/remoting_apk_tmpl.gni

@@ -16,5 +16,6 @@ template("remoting_apk_tmpl") {
     android_manifest_dep = "//remoting/android:remoting_apk_manifest"
     shared_libraries = [ "//remoting/client/jni:remoting_client_jni" ]
     version_name = chrome_version_name
+    version_code = chrome_version_code
   }
 }