Reduce insert_values length in QueryResultSerializerTest.RandomSizes

The long queries cause sqlite3 to overflow the call stack in Windows
ASan builds with the latest LLVM version (see #comment15 and following
on the bug).

Bug: chromium:367746304
Change-Id: I474daad7a023959f631e7f66270789047c707a7e

src/trace_processor/rpc/query_result_serializer_unittest.cc

@@ -376,7 +376,7 @@ TEST(QueryResultSerializerTest, RandomSizes) {
       insert_values += ",";
     } else {
       insert_values += "),";
-      if (insert_values.size() > 1024 * 1024 || i == kNumCells - 1) {
+      if (insert_values.size() > 100 * 1024 || i == kNumCells - 1) {
         insert_values[insert_values.size() - 1] = ';';
         auto query = "insert into tab (a,b,c) values " + insert_values;
         insert_values = "";