feat(duolingo/music): Refactor FullSongsPatch for constructor retrieval

- Replace the constructor retrieval method with a more explicit approach using MethodUtil.
- Ensure compatibility with the latest structure of the musicCourseFingerprint class.
- Maintain functionality to unlock licensed songs by modifying the access field.

No breaking changes introduced.

Author: Viole403

patches/src/main/kotlin/app/revanced/patches/duolingo/music/FullSongsPatch.kt

@@ -4,10 +4,11 @@ import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
 import app.revanced.patcher.extensions.InstructionExtensions.instructions
 import app.revanced.patcher.patch.bytecodePatch
 import app.revanced.patches.duolingo.shared.Utils.fieldFromToString
-import app.revanced.util.constructor
+import com.android.tools.smali.dexlib2.AccessFlags
+import com.android.tools.smali.dexlib2.util.MethodUtil
 
 @Suppress("unused")
-val UnlockFullSongsPatch = bytecodePatch(
+val unlockFullSongsPatch = bytecodePatch(
     name = "Unlock licensed songs",
     description = "Allows playing the full version of licensed music instead of the 30-second preview."
 ) {
@@ -16,7 +17,7 @@ val UnlockFullSongsPatch = bytecodePatch(
     execute {
         musicCourseFingerprint.classDef.apply {
             val accessField = this.fieldFromToString("licensedMusicAccess")
-            val constructor = this.constructor()
+            val constructor = this.methods.first { MethodUtil.isConstructor(it) }
             constructor.addInstructions(
                 constructor.instructions.count() - 1,
                 """