[MP] Clamp scr_conspeed to be in the range 1-100

It was possible to set scr_conspeed to a negative value, which would cause
the console to expand when the user wanted to close it, instead of
shrinking (and then disappearing).
[SP] Clamp scr_conspeed to be in the range 1-100

It was possible to set scr_conspeed to a negative value, which would cause
the console to expand when the user wanted to close it, instead of
shrinking (and then disappearing).