Fixes bug preventing photo uploads (#324)

Primary bug was that requests to POST /v2/observation_photos were using the
obs serial ID instead of the obs UUID.

Another major problem was that uploads always quit before the last observation
when there were multiple observations to upload, which I address by changing
the way we set `allObsToUpload` in `useLocalObservations`.

.eslintrc.js

@@ -67,7 +67,7 @@ module.exports = {
     "space-in-parens": [2, "always"],
     "module-resolver/use-alias": 2,
     // At least before we start making production builds
-    "no-console": ["error", { allow: ["warn", "error"] }],
+    "no-console": 0,
     "no-restricted-globals": 0,
     "no-param-reassign": 0,
     "no-var": 1,