cnc-structure sequences tickrate fixed

Strucutre animations were too fast in many cases. These values seem to match up correctly to C&C 95.

Obelisk - Have not yet fixed (will do so when I fix how it fires)
SAM site - Someone may later decide to speed up how fast it pops up, for gameplay purposes
Merge pull request #2701 from psydev/patch-49

[cnc] structure sequences tick-rates corrected