Fix default arguments of benchmarks (#718)

While working on effekt-lang/effekt-plots#10,
I've realized that the default arguments for the benchmarks are not
working as expected (mostly because of formatting issues that we somehow
missed).

Also, we need to consider a different argument for
`effect_handlers_bench/resume_nontail` because the JS backend can't
handle `10000` (for now I've set it to 1000)

Author: marvinborner

examples/benchmarks/config_default.txt

@@ -1,26 +1,24 @@
-are_we_fast_yet/bounce.effekt 50
-are_we_fast_yet/list_tail.effekt 15
-are_we_fast_yet/mandelbrot.effekt 1
-are_we_fast_yet/nbody.effekt 1
-are_we_fast_yet/permute.effekt 6
-are_we_fast_yet/queens.effekt 8
-are_we_fast_yet/sieve.effekt 5000
-are_we_fast_yet/storage.effekt 1
-are_we_fast_yet/towers.effekt 13
-duality_of_compilation/erase_unused.effekt 10000
-duality_of_compilation/factorial_accumulator.effekt 10000000
-duality_of_compilation/fibonacci_recursive.effekt 40
-duality_of_compilation/iterate_increment.effekt 100000000
-duality_of_compilation/lookup_tree.effekt 10000000
-duality_of_compilation/match_options.effekt 10000000
-duality_of_compilation/sum_range.effekt 10000000
-effect_handlers_bench/countdown.effekt 200000000
-effect_handlers_bench/fibonacci_recursive.effekt 42
-effect_handlers_bench/generator.effekt 25
-effect_handlers_bench/iterator.effekt 40000000
-effect_handlers_bench/nqueens.effekt 12
-effect_handlers_bench/parsing_dollars.effekt 20000
-effect_handlers_bench/product_early.effekt 100000
-effect_handlers_bench/resume_nontail.effekt 10000
-effect_handlers_bench/tree_explore.effekt 16
-effect_handlers_bench/triples.effekt 300
+are_we_fast_yet/bounce 50
+are_we_fast_yet/list_tail 15
+are_we_fast_yet/mandelbrot 1
+are_we_fast_yet/nbody 1
+are_we_fast_yet/permute 6
+are_we_fast_yet/queens 8
+are_we_fast_yet/sieve 5000
+are_we_fast_yet/storage 1
+are_we_fast_yet/towers 13
+duality_of_compilation/erase_unused 10000
+duality_of_compilation/factorial_accumulator 10000000
+duality_of_compilation/fibonacci_recursive 40
+duality_of_compilation/iterate_increment 100000000
+duality_of_compilation/lookup_tree 10000000
+duality_of_compilation/match_options 10000000
+duality_of_compilation/sum_range 10000000
+effect_handlers_bench/countdown 200000000
+effect_handlers_bench/iterator 40000000
+effect_handlers_bench/nqueens 12
+effect_handlers_bench/parsing_dollars 20000
+effect_handlers_bench/product_early 100000
+effect_handlers_bench/resume_nontail 10000
+effect_handlers_bench/tree_explore 16
+effect_handlers_bench/triples 300