Fix: isIsBoolean -> isBoolean

src/main/java/de/monticore/lang/monticar/generator/cpp/converter/TypeConverter.java

@@ -47,7 +47,7 @@ public class TypeConverter {
         if (mathValueType.getDimensions().size() == 0) {
             if (mathValueType.getType().isWholeNumber()) {
                 return "int";//use int for now add range check if bigger number is required
-            } else if(mathValueType.getType().isIsBoolean()){
+            } else if(mathValueType.getType().isBoolean()){
                 return "bool";
             }
             return "double";