mcsat heuristic update -- use similar heuristic parameters as in cdclt #397

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 15s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 8s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 53s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 16s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 5s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	5m 22s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 18s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 31s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 59s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 13s
	57m 0s

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