Fix bug with tower interface

[sdiaz7]

Clicking the interface buttons when they are over a tower opens the interface of that tower, rather than performing the requested action.

Definition of Done:

• [x] Tower interface appearance disabled when opened.
• [x] Tower interface reenabled when current one gets closed.

Time estimated: 1 hour

Branch: dev_Issue282

Pull request: #283

[NestorTejero]

Prova:

• [ ] funciona X
• [x] funciona Y

[sdiaz7]

Bug was caused by the way the if-else conditions where sorted.

Old pseudocode:

if upgrade button clicked and tower selected:
    upgrade selected tower

else if tower clicked:
    set clicked tower as tower selected

else if sell button clicked and tower selected:
    sell selected tower

else
    close interface

Making the tower selection checkout before the buying tower causes that when the associated button is clicked over a tower the code takes the tower and does not perform the sale. Fixed pseudocode:

if upgrade button clicked and tower selected:
    upgrade selected tower

else if sell button clicked and tower selected:
    sell selected tower

else if tower clicked:
    set clicked tower as tower selected

else
    close interface

Now the "sell button clicked" condition has priority over the "tower clicked one". With this little modification the code works as was expected. I proceed to open the pull request

[agonzatr17]

Issue done perfectly, see Pull Request #283 for more info.