Fix .tcl when there is a bind log.

[DasBrain]

Found by: DasBrain
Patch by: DasBrain
Fixes:

One-line summary:
Fix .tcl when there is a bind log.

Additional description (if needed):
If there is a bind log active, then debug3 will execute code in the interpreter, changing the result.
So: Store the result before calling debug3.

Or put differently: Don't use the Tcl interpreter between evaluating stuff and getting the result.

Test cases demonstrating functionality (if applicable):
In dcc:

.tcl string cat foo
.tcl bind log * +|+ {string cat}
.tcl string cat foo

The second .tcl will not output foo