[Linux] Quote another variable expansion that should be quoted
[Linux] Quote another variable expansion that should be quoted

Otherwise, bad things can happen if TBB is in a directory whose name
contains spaces.
(cherry picked from commit 02148bded38663e0906a4a63f7783a245ce4fe0b)

Shondoit/torbrowser,Shondoit/torbrowser,Shondoit/torbrowser,Shondoit/torbrowser