fix(kanban): add parens to statement-position PrintUsage call

Commit 50b8d75e made parentheses mandatory on statement-position calls,
but kanban_app.pas was not updated, so 'PrintUsage' (a bare reference in
the --help branch) failed to parse with 'Bare reference to PrintUsage
requires () for a call'. This broke a plain 'pasbuild compile', which
reaches blaise-kanban before blaise-bif-coverage. Add the parens.

tools/kanban/src/main/pascal/kanban_app.pas

@@ -67,7 +67,7 @@ begin
     Arg := ParamStr(I);
 
     if (Arg = '--help') or (Arg = '-h') then
-      PrintUsage
+      PrintUsage()
 
     else if Arg = '--add' then
     begin