Call 'say' outside test_expect_success

There were some uses of 'say' inside test_expect_success. But if the tests
were not run in verbose mode, this message went to /dev/null. Pull them out
of test_expect_success.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>

t/t3600-rm.sh

@@ -21,10 +21,11 @@ embedded'
 embedded' &&
      git commit -m 'add files with tabs and newlines'
      else
-         say 'Your filesystem does not allow tabs in filenames.'
          test_tabs=n
      fi"
 
+test "$test_tabs" = n && say 'Your filesystem does not allow tabs in filenames.'
+
 # Later we will try removing an unremovable path to make sure
 # git rm barfs, but if the test is run as root that cannot be
 # arranged.