Squash warnings about unhandled enumeration.

[JamesB192]

from downstream user ntpsec with --enable-warnings

[119/213][55%][|][=====================================================>                                           ][1.309s]../../tests/unity/unity.c: In function ‘UnityAssertFloatSpecial’:
../../tests/unity/unity.c:984:5: warning: enumeration value ‘UNITY_FLOAT_INVALID_TRAIT’ not handled in switch [-Wswitch-enum]
  984 |     switch (style)
      |     ^~~~~~
../../tests/unity/unity.c: In function ‘UnityAssertDoubleSpecial’:
../../tests/unity/unity.c:1124:5: warning: enumeration value ‘UNITY_FLOAT_INVALID_TRAIT’ not handled in switch [-Wswitch-enum]
 1124 |     switch (style)
      |     ^~~~~~

[213/213][100%][-][===============================================================================================>][1.778s]