issue #538: default terrain

I think it's unnecessary, so delete it

conf/e2/terrains.json

@@ -283,14 +283,6 @@
         },
         "wall1": {
             "flags": [ "forbidden", "land" ]
-        },
-        "default": {
-            "size": 0,
-            "herbs": [],
-            "seed": 0,
-            "road": 0,
-            "flags": [ "land", "walk", "sail", "fly" ],
-            "production": {}
         }
     }
 }

src/reports.c

@@ -1540,7 +1540,7 @@ int write_reports(faction * f, time_t ltime)
     }
     prepare_report(&ctx, f);
     get_addresses(&ctx);
-    log_debug("Reports for %s:", factionname(f));
+    log_debug("Reports for %s", factionname(f));
     for (rtype = report_types; rtype != NULL; rtype = rtype->next) {
         if (f->options & rtype->flag) {
             int error = 0;