Revert "Adjust paths in buildbolt-symbolize-crashes.sh."

This reverts commit 8ef8ad5ab4f1510b0a7faa6d7c5db7e66b58f083.

Reason for revert: development/scripts/symbol.py now uses an absolute path to llvm-cxxfilt when run locally.

Change-Id: Ic405d3a6e8652d4896e8aef34a70ec8e234c537d