[integration-test] [ci/cd] Fix install-client-sources script (#1588)

**Link the Issue(s) this Pull Request is related to.**
N/A

**Summarize your change.**
Fixes broken filepath of ci/fix_compiled_proto.py directory.
Identified as it broke the integration test script.

sandbox/install-client-sources.sh

@@ -10,7 +10,7 @@ python -m grpc_tools.protoc -I=. \
   --python_out=../pycue/opencue/compiled_proto \
   --grpc_python_out=../pycue/opencue/compiled_proto ./*.proto
 cd ..
-python ../ci/fix_compiled_proto.py pycue/opencue/compiled_proto
+python ci/fix_compiled_proto.py pycue/opencue/compiled_proto
 
 # Install all client packages.
 pip install pycue/ pyoutline/ cueadmin/ cuesubmit/ cuegui/