Make it possible to create a freezer masternode or show a confirmation dialog that it won't be a freezer masternode

#### Which feature is your request related to?
Creating a masternode within the Desktop Wallet.

#### Is your request related to a problem? Please describe.
It happened to me and others that they created a masternode within the Desktop Wallet to find out it is an unfrozen node.

That costs lots of time and unnecessary DFI.

#### Describe the solution you'd like:
This step needs to be more clear to users showing either a message which has to be confirmed so users are aware that the masternode will not be frozen or add a step to create 5/10 years frozen nodes.

At least inform users that they have to use the cli and maybe even tell them the command or a link to some guide.

#### Describe alternatives you've considered:

#### Additional context: