chore(rating.component): adjust interactive check
chore(rating.component): adjust interactive check

The method of checking for interactivity has been switched from using
`ngIf` to a simple `if` statement in the `update` function. this is mostly
just for code reduction and template simplification.

kuiqiang/cvp,gunnertech/rednotebook,Spirovanni/ampdin,angeltrickz/prueba_vulgar,juansaucedo/develook,rschellius/vulgar,datatypevoid/vulgar,juansaucedo/develook,rschellius/vulgar,juansaucedo/develook,kuiqiang/cvp,Spirovanni/ampdin,angeltrickz/prueba_vulgar,datatypevoid/vulgar,datatypevoid/vulgar,kuiqiang/cvp,angeltrickz/prueba_vulgar,datatypevoid/ng2-mean-webpack,Spirovanni/ampdin,datatypevoid/ng2-mean-webpack,rschellius/vulgar,datatypevoid/ng2-mean-webpack