paramとpropertyを間違えており正常に文字列へのマッピングができていなかったため修正

Author: k163377

src/main/kotlin/com/mapk/kmapper/BoundParameterForMap.kt

@@ -37,7 +37,7 @@ internal class BoundParameterForMap<S : Any>(val param: KParameter, property: KP
             paramClazz.java.isEnum && propertyClazz == String::class -> { {
                 EnumMapper.getEnum(paramClazz.java, propertyGetter.invoke(it) as String)
             } }
-            propertyClazz == String::class -> { { propertyGetter.invoke(it).toString() } }
+            paramClazz == String::class -> { { propertyGetter.invoke(it).toString() } }
             else -> throw IllegalArgumentException("Can not convert $propertyClazz to $paramClazz")
         }
     }