libsnark: Don't (implicitly) rely on other tests initializing the public params

If the other tests are not run, these tests crash with a segfault.

src/snark/libsnark/relations/arithmetic_programs/qap/tests/test_qap.cpp

@@ -86,6 +86,8 @@ void test_qap(const size_t qap_degree, const size_t num_inputs, const bool binar
 
 TEST(relations, qap)
 {
+    alt_bn128_pp::init_public_params();
+
     start_profiling();
 
     const size_t num_inputs = 10;

src/snark/libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/tests/test_r1cs_ppzksnark.cpp

@@ -38,6 +38,8 @@ void test_r1cs_ppzksnark(size_t num_constraints,
 
 TEST(zk_proof_systems, r1cs_ppzksnark)
 {
+    alt_bn128_pp::init_public_params();
+
     start_profiling();
 
     test_r1cs_ppzksnark<alt_bn128_pp>(1000, 20);