Use more portable syntax in codeql-tools/autobuild.sh

Author: igfoo

codeql-tools/autobuild.sh

@@ -11,7 +11,7 @@ fi
 LGTM_SRC="$(pwd)"
 export LGTM_SRC
 
-if [ "${CODEQL_EXTRACTOR_GO_BUILD_TRACING:-}" == "on" ]; then
+if [ "${CODEQL_EXTRACTOR_GO_BUILD_TRACING:-}" = "on" ]; then
   echo "Tracing enabled"
   "$CODEQL_EXTRACTOR_GO_ROOT/tools/$CODEQL_PLATFORM/go-build-runner"
 else