Revert "Fix thread starvation caused by not yielding or using an inappropriate thread pool (#2955)"

This reverts commit 22d5c9d9f4.

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -23,7 +23,6 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
-import kotlinx.coroutines.launch
 import logcat.LogPriority
 import tachiyomi.core.common.util.lang.withUIContext
 import tachiyomi.core.common.util.system.logcat
@@ -119,19 +118,17 @@ class ExtensionManager(
      * Loads and registers the installed extensions.
      */
     private fun initExtensions() {
-        scope.launch {
-            val extensions = ExtensionLoader.loadExtensions(context)
+        val extensions = ExtensionLoader.loadExtensions(context)
 
-            installedExtensionMapFlow.value = extensions
-                .filterIsInstance<LoadResult.Success>()
-                .associate { it.extension.pkgName to it.extension }
+        installedExtensionMapFlow.value = extensions
+            .filterIsInstance<LoadResult.Success>()
+            .associate { it.extension.pkgName to it.extension }
 
-            untrustedExtensionMapFlow.value = extensions
-                .filterIsInstance<LoadResult.Untrusted>()
-                .associate { it.extension.pkgName to it.extension }
+        untrustedExtensionMapFlow.value = extensions
+            .filterIsInstance<LoadResult.Untrusted>()
+            .associate { it.extension.pkgName to it.extension }
 
-            _isInitialized.value = true
-        }
+        _isInitialized.value = true
     }
 
     /**