Fixed bug in CCommand constructor that could append junk to the comma…

[TravisWehrman]

…nd string

• Missed copying the null terminator
• Since m_pArgSBuffer is not initialized this problem can occur when the (command string buffer length) + 1 char in m_pArgSBuffer array happens to be non-zero.

[SC1040-TS2]

…nd string

• Missed copying the null terminator
• Since m_pArgSBuffer is not initialized this problem can occur when the (command string buffer length) + 1 char in m_pArgSBuffer array happens to be non-zero.

Necroposter here. This also seems to affect the SP/src/tier1/convar.cpp as well. A programmer should have been pinged for this.