Changed calling convention for shared pointers.

Expect non-reference type shared pointers arguments instead of references
to shared pointer. This will make it clear to the caller that the called
function is making a copy of the pointer for its own use and not trying
to modify the original pointer of the caller.

flow/flow_ebos_gaswater.cpp

@@ -66,10 +66,10 @@ public:
 }}
 
 namespace Opm {
-void flowEbosGasWaterSetDeck(double setupTime, std::shared_ptr<Deck>& deck,
-                           std::shared_ptr<EclipseState>& eclState,
-                           std::shared_ptr<Schedule>& schedule,
-                           std::shared_ptr<SummaryConfig>& summaryConfig)
+void flowEbosGasWaterSetDeck(double setupTime, std::shared_ptr<Deck> deck,
+                           std::shared_ptr<EclipseState> eclState,
+                           std::shared_ptr<Schedule> schedule,
+                           std::shared_ptr<SummaryConfig> summaryConfig)
 {
     using TypeTag = Properties::TTag::EclFlowGasWaterProblem;
     using Vanguard = GetPropType<TypeTag, Properties::Vanguard>;