fix(route/mastodon): Correct the only_media param #29701

Job	Run time
Build radar and maintainer on Node 23	43s
Build radar and maintainer on Node 22	37s
Build radar and maintainer on Node 20	32s
Vitest puppeteer on Node latest with bundled Chromium	1m 19s
Vitest puppeteer on Node latest with Chromium from Ubuntu	2m 10s
Vitest puppeteer on Node latest with Chrome from Google	1m 29s
Vitest on Node latest	1m 35s
Vitest on Node lts/*	1m 37s
Vitest on Node lts/-1	1m 25s
Vitest puppeteer on Node lts/* with bundled Chromium	1m 11s
Vitest puppeteer on Node lts/* with Chromium from Ubuntu	2m 12s
Vitest puppeteer on Node lts/* with Chrome from Google	1m 29s
Vitest puppeteer on Node lts/-1 with bundled Chromium	1m 21s
Vitest puppeteer on Node lts/-1 with Chromium from Ubuntu	1m 47s
Vitest puppeteer on Node lts/-1 with Chrome from Google	1m 24s
automerge	0s
	20m 51s

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