removed unnessasary persistant file

src/test/java/net/openhft/chronicle/map/DemoChronicleMapTest.java

@@ -3,7 +3,6 @@ package net.openhft.chronicle.map;
 import net.openhft.lang.model.DataValueClasses;
 import net.openhft.lang.model.constraints.MaxSize;
 import net.openhft.lang.values.IntValue;
-import org.junit.Ignore;
 import org.junit.Test;
 
 import java.io.File;
@@ -51,6 +50,8 @@ public class DemoChronicleMapTest {
                 assertNotNull(v);
             }
         }
+
+        file.delete();
     }
 
     @Test
@@ -93,6 +94,7 @@ public class DemoChronicleMapTest {
                 assertNotNull(v);
             }
         }
+        file.delete();
     }
 }