Change threshold in 01_PW/208_PW_CG_float (#7241)

* Optimize install_openmpi.sh script

* change threshold in 01_PW/208_PW_CG_float

---------

Co-authored-by: Fei Yang <2501213217@stu.pku.edu.cn>

Author: 19hello

tests/01_PW/208_PW_CG_float/threshold

@@ -1,5 +1,5 @@
 # The float type possesses different precision compared to the double type. 
 # This integration aims to test the functionality of the float type 
 # within the plane-wave (pw) basis
-threshold 0.00001
+threshold 0.00002
 fatal_threshold 1