tests: remove protected file forcibly for portability

Before this patch, test-command-template.t is timed out on Solaris,
because "rm" on permission denied file implies prompting "override
protection 0 (yes/no)?" and blocks execution of test script.

tests/test-command-template.t

@@ -1018,7 +1018,7 b' Error if include fails:'
   $ hg log --style ./t
   abort: template file ./q: Permission denied
   [255]
-  $ rm q
+  $ rm -f q
 #endif
 
 Include works: