Bug 1678373 - Adjust media telemetry attributes. r=alwu

2h is a bit short for video.

Percentage need to be linear and between 0 and 100. 50 buckets are good enough,
having 100 buckets doesn't work, it needs to be lower than the `high` value.

Differential Revision: https://phabricator.services.mozilla.com/D125846

toolkit/components/telemetry/Histograms.json

@@ -13304,7 +13304,7 @@
     "expires_in_version": "never",
     "description": "Total time spent playing video in milliseconds.",
     "kind": "exponential",
-    "high": 7200000,
+    "high": 14400000,
     "n_buckets": 100,
     "bug_numbers": [1261955, 1127646, 1570634, 1567604, 1685399],
     "releaseChannelCollection": "opt-out"
@@ -13317,7 +13317,7 @@
     "description": "Total time spent playing media in milliseconds, keyed by its content (Audio and video, audio only, video only, audio and video but audio inaudible, audio and video but audio muted).",
     "keyed": true,
     "kind": "exponential",
-    "high": 7200000,
+    "high": 14400000,
     "n_buckets": 100,
     "bug_numbers": [1678373],
     "releaseChannelCollection": "opt-out"