Docker: Fix filtering without a filter

If there is no filter accept all instead of nothing.
Fixes e.g. ABI detection on docker image running
on Windows.

Change-Id: I17588f71018952b1087b5b8f700b6c158bf5b89d
Reviewed-by: hjk <hjk@qt.io>

src/plugins/docker/dockerdevice.cpp

@@ -1301,7 +1301,7 @@ static FilePaths filterEntriesHelper(const FilePath &base,
             if (match.hasMatch())
                 return true;
         }
-        return false;
+        return nameRegexps.isEmpty();
     };
 
     // FIXME: Handle sort and filters. For now bark on unsupported options.