message: test: adjust test expectations following the fix
  Followup of
  fix: off-by-one error in insertion position
diff: @@ -13,7 +13,7 @@ TEST(stripInsertions, StripsAnInsertion) {
  EXPECT_EQ(toString(res.queryStripped), toString(expected));
  EXPECT_EQ(res.insertions.size(), 1);
  - EXPECT_EQ(res.insertions[0].pos, 3);
  + EXPECT_EQ(res.insertions[0].pos, 2);
  EXPECT_EQ(res.insertions[0].length, 3);
  EXPECT_EQ(toString(res.insertions[0].ins), "GCG");
  }
  