correct lemmas limit in the multi-check mode (#484) #310

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	7m 3s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	8m 40s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 15s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	3m 41s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	4m 52s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	4m 41s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 18s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 21s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 14s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	7m 11s
	51m 16s

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