e-wm-sysactions-shr: Drop RPROVIDES

* e-wm always builds e-wm-sysactions package, so bitbake is showing NOTE
  about 2 providers building it, we don't really need it as all runtime
  dependencies are respecting ESYSACTIONS variable, so drop RPROVIDES

  NOTE: multiple providers are available for runtime e-wm-sysactions (e-wm, e-wm-sysactions-shr)
  NOTE: consider defining a PREFERRED_PROVIDER entry to match e-wm-sysactions

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>