tests: intenral: fuzzers: fixed a wrong data type used for an option

Signed-off-by: Leonardo Alminana <[email protected]>

tests/internal/fuzzers/config_map_fuzzer.c

@@ -13,7 +13,7 @@ struct context {
     int num_int;
     size_t size;
     time_t time;
-    char boolean;
+    int boolean;
     double num_double;
     flb_sds_t string;
     struct mk_list *list1;