www/receiptomatic-www: Fix some cppcheck style issues
www/receiptomatic-www: Fix some cppcheck style issues

This fixes the following cppcheck reported style issues

receiptomatic-www.c:176:26: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & ADMIN ? "admin," : "",
                         ^
receiptomatic-www.c:177:29: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & APPROVER ? "approver -" : "",
                            ^
receiptomatic-www.c:178:34: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & APPROVER_CARD ? "card" : "",
                                 ^
receiptomatic-www.c:179:34: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & APPROVER_CASH ? "cash" : "",
                                 ^
receiptomatic-www.c:180:36: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & APPROVER_CHEQUE ? "cheque" : "",
                                   ^
receiptomatic-www.c:181:34: style: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
    capabilities & APPROVER_SELF ? "self" : "");
                                 ^
By wrapping the capabilities check in ( ).

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@digital-domain.net>

ac000/receiptomatic