Don't spawn enemies in LOS

[Grond]

Currently, enemies can be generated in areas within your line of sight. This is weird, makes resting in dungeons tedious, and can easily lead to unfair deaths. It shouldn't happen.

[adom-admin]

Fixed for ADOM II 0.3.2. Please send your real name to creator(at)ancientdomainsofmystery.com for it to be included in the credits. (If you were already asked to do so you can ignore this message. Please include a reference to the bug or RFE you are credited for.)

Fixed in 99.9% of the cases. There might be some rare cases where this cannot be avoided.