tests: relax "Connection refused" match

We already had the match relaxed on Windows, but on Google Compute
Engine VMs I'm seeing "Network is unreachable" instead of "Connection
refused". At this point, just give up and make sure we get an error back.

tests/test-bad-pull.t

@@ -1,14 +1,8 b''
 #require serve killdaemons
 
-#if windows
   $ hg clone http://localhost:$HGPORT/ copy
   abort: * (glob)
   [255]
-#else
-  $ hg clone http://localhost:$HGPORT/ copy
-  abort: error: Connection refused
-  [255]
-#endif
 
   $ test -d copy
   [1]

tests/test-static-http.t

@@ -1,14 +1,8 b''
 #require killdaemons
 
-#if windows
   $ hg clone http://localhost:$HGPORT/ copy
   abort: * (glob)
   [255]
-#else
-  $ hg clone http://localhost:$HGPORT/ copy
-  abort: error: Connection refused
-  [255]
-#endif
   $ test -d copy
   [1]