Minus is being deleted with the first digit

[bartlomiejstrzelczyk]

• Describe the bug

1. Create any numeric field with mask that allows negative values
2. Enter ex. -1350
3. Delete the first digit "1"
4. The minus sign is being deleted with the digit so 350 is the result instead of -350

• Add a link to a codepen, jsfiddle or other example page which shows the problem
  -
• OS:
• Linux
• Browser
• Chrome
• Inputmask version
• 5.0.9