Random Agent does Raise Action when it is not possible

[hlmaestretti]

When using the random agent, the raise action is still an available action, even when the player does not have enough chips to raise.

Here's what I tested:

Player_chips      bet_amount      Previous_raise       Expected_chips_to_raise                 Chips_to_raise
500                  10                 5                      15                                      15
500                  550                490                    n/a                                     990
200                  210                200                    n/a                                     410

[SirRender00]

Latest supported minor version for this: v0.5