fix: cibuildwheel.sh script

.gitlab/ci/cibuildwheel_build_deps_before_build_wheel.sh

 #!/bin/bash
 set -x
 set -e
-if [[ $repo ==  "" ]]; then # case for aidge_ core
+if [[ $AIDGE_DEPENDENCIES ==  "" ]]; then # case for aidge_ core
   mkdir -p build # creating build if its not already there to hold the build of cpp files
   rm -rf build/* # build from scratch
 else 
@@ -20,6 +20,7 @@ else
     mkdir -p build # creating build if its not already there to hold the build of cpp files
     rm -rf build/* # build from scratch
     pip install . -v
+    cd -
   done
 fi
 set +x