Correct the code of flexric installation

openairinterface5g/openairinterface-install-scripts/flexRIC_oai_gNB_and_oai_UE_install.sh

@@ -44,6 +44,7 @@ sudo make install
 ## Install FlexRIC
 sudo rm -rf /usr/local/lib/flexric/
 cd $WORK_DIR/
+sudo rm -rf flexric/
 git clone https://gitlab.eurecom.fr/mosaic5g/flexric.git
 cd $WORK_DIR/flexric
 git checkout d3ff879135d036632d7938c2085dbf4577759225
@@ -56,6 +57,7 @@ sudo make install
 
 ## Install OAI UE and OAI gNB
 cd $WORK_DIR/
+sudo rm -rf flexric/
 git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git oai
 cd $WORK_DIR/oai
 git checkout v2.0.0