Fix non-bundled tests against macOS system SQLite

[thomcc]

On macOS we fail some tests when they're run against system SQLite. These may be bugs in the macOS system SQLite (since PRAGMA compile_options says that BUG_COMPATIBLE_20160819 is enabled, which seems a little ominous), but the fixes for these are easy enough.

I only bothered checking that the mode behaves as expected for bundled in test_pragma_query_row and not in pragma_update_and_check, since the latter seems to be mostly about testing that compilation doesn't fail.

[thomcc]

I'm just going to land this after CI is green since it's trivial and is bothering me right now.

[codecov]

Codecov Report

Merging #1153 (e90ed8e) into master (f8b9ad8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1153   +/-   ##
=======================================
  Coverage   78.21%   78.22%           
=======================================
  Files          47       47           
  Lines        5927     5929    +2     
=======================================
+ Hits         4636     4638    +2     
  Misses       1291     1291           

Impacted Files	Coverage Δ
src/lib.rs	90.10% <100.00%> (ø)
src/pragma.rs	90.99% <100.00%> (+0.04%)	⬆️
tests/deny_single_threaded_sqlite_config.rs	100.00% <100.00%> (ø)

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