Fixed warnings

src/storm-dft/storage/dft/elements/DFTPand.h

@@ -50,7 +50,7 @@ namespace storm {
             }
             
             std::string typestring() const override {
-                return "PAND" + inclusive ? "" : "-ex";
+                return inclusive ? "PAND" : "PAND-ex";
             }
         protected:
             bool inclusive;

src/storm-dft/storage/dft/elements/DFTPor.h

@@ -42,7 +42,7 @@ namespace storm {
             }
             
             std::string  typestring() const override {
-                return "POR" + inclusive ? "" : "-ex";
+                return inclusive ? "POR" : "POR-ex";
             }
             
             bool isInclusive() {