Fix tags for WebRequest::Manual() unit test

Don't give it any tags other than "." as we don't want to execute it
when these tags are specified, only when it's explicitly selected by
using its name on the command line.

tests/net/webrequest.cpp

@@ -297,7 +297,7 @@ TEST_CASE_METHOD(RequestFixture,
 
 // This test is not run by default and has to be explicitly selected to run.
 TEST_CASE_METHOD(RequestFixture,
-                 "WebRequest::Manual", "[net][webrequest][auth][.]")
+                 "WebRequest::Manual", "[.]")
 {
     // Allow getting 8-bit strings from the environment correctly.
     setlocale(LC_ALL, "");