eliminate extra space in DDL

Author: gavinking

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java

@@ -451,8 +451,7 @@ public String getAddForeignKeyConstraintString(
 			String[] primaryKey,
 			boolean referencesPrimaryKey) {
 		final StringBuilder result = new StringBuilder( 30 )
-				.append( " add constraint " )
-				.append( " foreign key (" )
+				.append( " add constraint foreign key (" )
 				.append( String.join( ", ", foreignKey ) )
 				.append( ") references " )
 				.append( referencedTable );