Fix vim :w artifact in load_checkpoint.sh
Line 961 contained a stray ':w' appended to a bail() string literal,
a vim write command that was accidentally saved into the source file:
bail "SERVERID not detected...":w
In bash, this concatenates ':w' onto the string, causing every execution
of that error path to display a message ending in ':w'. Removed the
trailing ':w' so the error message is displayed correctly.