feat(Utils): Refactor toString method retrieval in ClassDef

- Replace direct call to toStringMethod() with a search for the "toString" method in ClassDef.
- This change improves clarity and ensures the correct method is being referenced.

No breaking changes introduced.

Author: Viole403

patches/src/main/kotlin/app/revanced/patches/duolingo/shared/Utils.kt

@@ -4,7 +4,6 @@ import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
 import app.revanced.patcher.patch.PatchException
 import app.revanced.util.getReference
 import app.revanced.util.indexOfFirstInstructionOrThrow
-import app.revanced.util.toStringMethod
 import com.android.tools.smali.dexlib2.Opcode
 import com.android.tools.smali.dexlib2.iface.ClassDef
 import com.android.tools.smali.dexlib2.iface.instruction.ReferenceInstruction
@@ -15,7 +14,7 @@ internal object Utils {
     // Gets field from toString() method with the following format:
     //  toString() { return "[Class]([field1]=" + this.a + "[field2]=" + this.b + ... + ")"; }
     internal fun ClassDef.fieldFromToString(subStr: String): FieldReference {
-        val toString = this.toStringMethod()
+        val toString = this.methods.first { it.name == "toString" }
         val strIndex = toString.indexOfFirstInstructionOrThrow() {
             this.opcode == Opcode.CONST_STRING &&
                     getReference<StringReference>()?.string?.contains(subStr) ?: false