Show last 50 lines on test failure instead of last 10

Makefile

@@ -312,7 +312,7 @@ endif
 	for TEST_BINARY in $(XML_TEST_BINARIES); do \
 		PARAMS="--xml:build/$${TEST_BINARY}.xml --console"; \
 		echo -e "\nRunning $${TEST_BINARY} $${PARAMS}\n"; \
-		build/$${TEST_BINARY} $${PARAMS} || { echo -e "\n$${TEST_BINARY} $${PARAMS} failed; Last 10 lines from the log:"; tail -n10 "$${TEST_BINARY}.log"; exit 1; }; \
+		build/$${TEST_BINARY} $${PARAMS} || { echo -e "\n$${TEST_BINARY} $${PARAMS} failed; Last 50 lines from the log:"; tail -n50 "$${TEST_BINARY}.log"; exit 1; }; \
 		done; \
 		rm -rf 0000-*.json t_slashprot_migration.* *.log block_sim_db
 	for TEST_BINARY in $(TEST_BINARIES); do \
@@ -321,7 +321,7 @@ endif
 		elif [[ "$${TEST_BINARY}" == "block_sim" ]]; then PARAMS="--validators=8000 --slots=160"; \
 		fi; \
 		echo -e "\nRunning $${TEST_BINARY} $${PARAMS}\n"; \
-		build/$${TEST_BINARY} $${PARAMS} || { echo -e "\n$${TEST_BINARY} $${PARAMS} failed; Last 10 lines from the log:"; tail -n10 "$${TEST_BINARY}.log"; exit 1; }; \
+		build/$${TEST_BINARY} $${PARAMS} || { echo -e "\n$${TEST_BINARY} $${PARAMS} failed; Last 50 lines from the log:"; tail -n50 "$${TEST_BINARY}.log"; exit 1; }; \
 		done; \
 		rm -rf 0000-*.json t_slashprot_migration.* *.log block_sim_db