Fix: Fix oversight in memory limit check

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/zip/CityGmlZipEntry.java

@@ -81,7 +81,7 @@ public class CityGmlZipEntry implements Serializable {
                 throw new IOException(e);
             }
         }
-        return memoryLimit > fileSize;
+        return memoryLimit > (fileSize / MB);
     }
 
     protected CityGmlZipEntry(ZipEntry entry, CityGmlZipArchive parentArchive, boolean decompressed) {