Galaxy Manga: updatre manga / chapter / page URL format

[vetleledaal]

Closes #2849

For comparison:

mangaDetailsRequest():
$apiUrl/webtoon/series/$id/$prefix
$apiUrl/series/$id/$prefix

chapterListRequest():
$apiUrl/webtoon/chapters/$id-desc#$prefix
$apiUrl/chapters/$id-desc#$prefix

pageListRequest():
$apiUrl/webtoon/chapters/chapter/$id/$prefix
$apiUrl/chapters/webtoon/$id/$prefix

Checklist:

• [x] Updated extVersionCode value in build.gradle for individual extensions
• [x] Updated overrideVersionCode or baseVersionCode as needed for all multisrc extensions
• [x] Referenced all related issues in the PR body (e.g. "Closes #xyz")
• [ ] Added the isNsfw = true flag in build.gradle when appropriate
• [x] Have not changed source names
• [x] Have explicitly kept the id if a source's name or language were changed
• [x] Have tested the modifications by compiling and running the extension through Android Studio
• [x] Have removed web_hi_res_512.png when adding a new extension

[AwkwardPeak7]

the english site works? usually these kind of api changes happen on both.

[vetleledaal]

Yep, Flix Scans (flixscans.org) still works with the old URLs. I tried making the same changes to that extension as well, but it started returning 404 errors.