CI: fixing incorrect space indentation

ci-scripts/main.py

ci-scripts/xml_files/enb_ue_usrp210_band7_epc_start.xml

ci-scripts/xml_files/enb_ue_usrp210_band7_test_05mhz_tm1.xml

...ipts/xml_files/enb_ue_usrp210_band7_test_05mhz_tm1_s1.xml

ci-scripts/xml_files/enb_usrp210_band13_build.xml

ci-scripts/xml_files/enb_usrp210_band13_test_10mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band40_build.xml

ci-scripts/xml_files/enb_usrp210_band40_epc_closure.xml

ci-scripts/xml_files/enb_usrp210_band40_test_05mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band40_test_10mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band40_test_20mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band40_tracer.xml

ci-scripts/xml_files/enb_usrp210_band7_build.xml

ci-scripts/xml_files/enb_usrp210_band7_test_05mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band7_test_10mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band7_test_20mhz_tm1.xml

ci-scripts/xml_files/enb_usrp210_band7_tracer.xml

ci-scripts/xml_files/f1_usrp210_band7_test_05mhz.xml

ci-scripts/xml_files/f1_usrp210_band7_test_10mhz.xml

ci-scripts/xml_files/f1_usrp210_band7_test_20mhz.xml