Remove rake spec::controllers from smoke tests

They are not generated by default anymore

Author: klyonrad

example_app_generator/run_specs.rb

@@ -7,7 +7,6 @@
 run('bin/rake --backtrace spec:requests') || abort
 run('bin/rake --backtrace spec:models') || abort
 run('bin/rake --backtrace spec:views') || abort
-run('bin/rake --backtrace spec:controllers') || abort
 run('bin/rake --backtrace spec:helpers') || abort
 run('bin/rake --backtrace spec:mailers') || abort
 run("bin/rake --backtrace stats") || abort