tests: fix populate hashing algorithm helper
tests: fix populate hashing algorithm helper

Commit c1ccfe was supposed to correct the hashing algorithms,
but it failed to address being able to properly pass
Python conditional arguments due to the fact that variable
expansion in bash doesn't occur inside of single quotes.

Correct this by inverting regular quotes with single quotes since
python can accept single quote literals.

Signed-off-by: William Roberts <60148e894dabf0b83bde1d460768794cd453c455@intel.com>

01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,01org/tpm2.0-tools