fix regression in cover fetching (#5621)

introduced in https://github.com/tachiyomiorg/tachiyomi/pull/4870
this was previously done here: https://github.com/tachiyomiorg/tachiyomi/blob/7d23fd8ef5bbb9efd12f65bb5c9670464dd6c0b1/app/src/main/java/eu/kanade/tachiyomi/data/glide/MangaThumbnailModelLoader.kt#L95 as part of https://github.com/tachiyomiorg/tachiyomi/pull/2908

this impacts Komga extension, where server url is manually provided by the user, but due to auto-correct on mobile keyboards the `http` prefix sometimes get capitalized to `Http`.

(cherry picked from commit 20264eecb9)

app/src/main/java/eu/kanade/tachiyomi/data/coil/MangaCoverFetcher.kt

@@ -148,7 +148,7 @@ class MangaCoverFetcher : Fetcher<Manga> {
     private fun getResourceType(cover: String?): Type? {
         return when {
             cover.isNullOrEmpty() -> null
-            cover.startsWith("http") || cover.startsWith("Custom-", true) -> Type.URL
+            cover.startsWith("http", true) || cover.startsWith("Custom-", true) -> Type.URL
             cover.startsWith("/") || cover.startsWith("file://") -> Type.File
             else -> null
         }