Fix tasks check function max time not being reset along with other stats

Each time the `tasks` CLI command is executed the task stats are reset to allow the max and average stats to represent the data since the last `tasks` command. However the task check function stats were not being reset so the "max" would represent the maximum value since boot.

src/test/unit/cli_unittest.cc

@@ -310,6 +310,7 @@ const char *armingDisableFlagNames[]= {
 void getTaskInfo(cfTaskId_e, cfTaskInfo_t *) {}
 void getCheckFuncInfo(cfCheckFuncInfo_t *) {}
 void schedulerResetTaskMaxExecutionTime(cfTaskId_e) {}
+void schedulerResetCheckFunctionMaxExecutionTime(void) {}
 
 const char * const targetName = "UNITTEST";
 const char* const buildDate = "Jan 01 2017";