[multi_role] multi_role example does not use the scan parameters set in SysConfig

SDK: 4.30.00.54

Example: multi_role

Summary: the scan parameters set in SysConfig are not used (instead we use some default parameters set in gap_scanner.h).

Suggested solution:

In multi_role_scanInit():

Replace:
// Set Scan PHY parameters{{}}
GapScan_setPhyParams(DEFAULT_SCAN_PHY, SCAN_TYPE_ACTIVE,
                     SCAN_PARAM_DFLT_INTERVAL, SCAN_PARAM_DFLT_WINDOW);
By:
// Set Scan PHY parameters{{}}
GapScan_setPhyParams(DEFAULT_SCAN_PHY, DEFAULT_SCAN_TYPE,
                     DEFAULT_SCAN_INTERVAL, DEFAULT_SCAN_WINDOW);
 

Bonus: the comment right before the function multi_role_advertInit() has a wrong copy/paste:

Replace:

* @fn multi_role_scanInit

By:

* @fn multi_role_advertInit

Thanks!