Fix ChunkEntity.isMoreRecentThan() if both chunks linked to last forward

Imagine scenario:

[chunkToCheck] -> [this] -> [lastForwardChunk]

Then, both `isLastForward` checks will not return, and also the `chunkToCheck.doesNextChunksVerifyCondition { it == this }` will return false.
Since both chunks are connected to the last forward chunk, `isMoreRecent()` will still return `true`, which is wrong in this case.
So do not only check if chunkToCheck has this as any of the next chunks, but also the other way round.

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/helper/ChunkEntityHelper.kt

@@ -223,6 +223,9 @@ internal fun ChunkEntity.isMoreRecentThan(chunkToCheck: ChunkEntity): Boolean {
     if (chunkToCheck.doesNextChunksVerifyCondition { it == this }) {
         return true
     }
+    if (this.doesNextChunksVerifyCondition { it == chunkToCheck }) {
+        return false
+    }
     // Otherwise check if this chunk is linked to last forward
     if (this.doesNextChunksVerifyCondition { it.isLastForward }) {
         return true