Clear method in GXproperties data type was not working (#877)

Issue: 109146
(cherry picked from commit 87b8d85)

Author: iroqueta

common/src/main/java/com/genexus/util/GXProperties.java

@@ -72,6 +72,7 @@ public int count() {
 
 	public void clear() {
 		properties.clear();
+		originalProperties.clear();
 	}
 
 	public GXProperty first() {