tests: fix template test output

tests/test-command-template.t

@@ -1366,25 +1366,25 b' Error on syntax:'
 Behind the scenes, this will throw TypeError
 
   $ hg log -l 3 --template '{date|obfuscate}\n'
-  abort: Template filter 'obfuscate' is not compatible with keyword 'date'
+  abort: template filter 'obfuscate' is not compatible with keyword 'date'
   [255]
 
 Behind the scenes, this will throw a ValueError
 
   $ hg log -l 3 --template 'line: {desc|shortdate}\n'
-  abort: Template filter 'shortdate' is not compatible with keyword 'desc'
+  abort: template filter 'shortdate' is not compatible with keyword 'desc'
   [255]
 
 Behind the scenes, this will throw AttributeError
 
   $ hg log -l 3 --template 'line: {date|escape}\n'
-  abort: Template filter 'escape' is not compatible with keyword 'date'
+  abort: template filter 'escape' is not compatible with keyword 'date'
   [255]
 
 Behind the scenes, this will throw ValueError
 
   $ hg tip --template '{author|email|date}\n'
-  abort: Template filter 'datefilter' is not compatible with keyword 'author'
+  abort: template filter 'datefilter' is not compatible with keyword 'author'
   [255]
 
   $ cd ..