Make some minor changes

app/src/main/java/org/schabi/newpipe/ktx/Throwable.kt

@@ -58,10 +58,8 @@ tailrec fun Throwable?.hasCause(checkSubtypes: Boolean, vararg causesToCheck: Cl
             if (causeClass.isAssignableFrom(this.javaClass)) {
                 return true
             }
-        } else {
-            if (causeClass == this.javaClass) {
-                return true
-            }
+        } else if (causeClass == this.javaClass) {
+            return true
         }
     }
 

app/src/main/java/org/schabi/newpipe/local/subscription/item/HeaderItem.kt

@@ -15,7 +15,7 @@ class HeaderItem(
     override fun bind(viewBinding: HeaderItemBinding, position: Int) {
         viewBinding.headerTitle.text = title
 
-        val listener: OnClickListener? = if (onClickListener != null) OnClickListener { onClickListener.invoke() } else null
+        val listener = onClickListener?.let { OnClickListener { onClickListener.invoke() } }
         viewBinding.root.setOnClickListener(listener)
     }
 

app/src/main/java/org/schabi/newpipe/streams/WebMWriter.java

@@ -712,7 +712,7 @@ public class WebMWriter implements Closeable {
             return 0;
         }
 
-        // TODO: in the adove code, find and select the shortest track for the desired kind
+        // TODO: in the above code, find and select the shortest track for the desired kind
         for (i = 0; i < infoTracks.length; i++) {
             if (kind == infoTracks[i].trackType) {
                 return i;