Fix Spelling Mistake in Error Message

[AllanRegush]

This PR fixes a spelling in error in the tests cmakelists file when project options are missing.

[codecov-commenter]

Codecov Report

Merging #41 (e787033) into main (f37c1ab) will increase coverage by 0.27%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   77.77%   78.04%   +0.27%     
==========================================
  Files           3        3              
  Lines          36       41       +5     
  Branches       19       12       -7     
==========================================
+ Hits           28       32       +4     
- Misses          7        8       +1     
  Partials        1        1              

Flag	Coverage Δ
Linux	27.77% <21.42%> (-9.26%)	:arrow_down:
Windows	77.50% <60.00%> (-2.50%)	:arrow_down:
macOS	27.77% <21.42%> (-10.69%)	:arrow_down:

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Impacted Files	Coverage Δ
src/main.cpp	57.14% <60.00%> (+14.28%)	:arrow_up:
test/tests.cpp	100.00% <0.00%> (ø)
test/constexpr_tests.cpp	100.00% <0.00%> (ø)

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