Fix the plugins/tool action files
These files only had text, the action was defined in krita/krita.action.
There are still tools in plugins that have their actions defined in
krita/krita.action, but splitting them out in action files in the plugins
can wait.
BUG:422729
(cherry picked from commit 5b41b826fb1d4fe8faf9a8d15b4def762dd468bc)