fix(tools): correct PATH escaping in ROCm profile script

The heredoc uses a quoted delimiter (ENVEOF) which disables variable expansion, but the content had backslash-escaped dollar signs. This wrote literal backslashes into /etc/profile.d/rocm.sh, causing PATH corruption. Remove the unnecessary backslashes since the quoted heredoc already prevents expansion during write.

Closes #12755

misc/tools.func

@@ -4653,8 +4653,8 @@ EOF
   # Environment (PATH + LD_LIBRARY_PATH)
   if [[ -d /opt/rocm ]]; then
     cat <<'ENVEOF' >/etc/profile.d/rocm.sh
-export PATH="\$PATH:/opt/rocm/bin"
-export LD_LIBRARY_PATH="\${LD_LIBRARY_PATH:+\$LD_LIBRARY_PATH:}/opt/rocm/lib"
+export PATH="$PATH:/opt/rocm/bin"
+export LD_LIBRARY_PATH="${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}/opt/rocm/lib"
 ENVEOF
     chmod +x /etc/profile.d/rocm.sh
     # Also make available for current session / systemd services