streaming/api: fix overlap check

In some cases a SBB could be seen as overlapping with the requested
offset, when it was in fact precisely before it. In some special cases
this could lead to the stream engine not progressing the 'raw' progress.

src/util-streaming-buffer.c

@@ -70,7 +70,7 @@ static inline int InclusiveCompare(StreamingBufferBlock *lookup, StreamingBuffer
     const uint64_t tre = intree->offset + intree->len;
     if (lre <= intree->offset)   // entirely before
         return -1;
-    else if (lre >= intree->offset && lre <= tre)    // (some) overlap
+    else if (lre >= intree->offset && lookup->offset < tre && lre <= tre)   // (some) overlap
         return 0;
     else
         return 1;   // entirely after