eina/value: use correct time types when comparing time types

eina/value: use correct time types when comparing time types

these functions all expect struct timeval, as the name implies

../src/lib/eina/eina_value.c: In function ‘_eina_value_type_tm_compare’:
../src/lib/eina/eina_value.c:3358:19: warning: array subscript 1 is outside array bounds of ‘time_t[1]’ {aka ‘long int[1]’} [-Warray-bounds]
 3358 |    struct timeval ret = *input;
      |                   ^~~
../src/lib/eina/eina_value.c:3569:11: note: while referencing ‘ta’
 3569 |    time_t ta, tb;
      |           ^~
../src/lib/eina/eina_value.c:3358:19: warning: array subscript 1 is outside array bounds of ‘time_t[1]’ {aka ‘long int[1]’} [-Warray-bounds]
 3358 |    struct timeval ret = *input;
      |                   ^~~
../src/lib/eina/eina_value.c:3569:15: note: while referencing ‘tb’
 3569 |    time_t ta, tb;

Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Differential Revision: https://phab.enlightenment.org/D11715