Find pattern widget: max results count is 100000, even the appropriate option is not set

Scenario to reproduce:

1. Open "data/samples/FASTA/human_T1.fa".
2. Open "Find pattern" options panel tab.
3. Ensure that "Limit results number to" option is not set, set the "RegExp" algorithm, enter a pattern ".".
   Expected state: 199950 results are found.
   Current state: 100000 results are found.

The "Limit results number to" option should be turned on by default, also algorithm shouldn't limit results in case if this option is not set.