Attach (recommended) or Link to PDF file here:
https://bitcoin.org/bitcoin.pdf

Configuration:
- Web browser and its version: all
- Operating system and its version: all
- PDF.js version: tested with 2.9.11, but most likely all versions
- Is a browser extension: no

Steps to reproduce the problem:
1. Type "a purely" (single space between "a" and "purely") - doesn't find anything
2. Type "a  purely" (two spaces between "a" and "purely") - finds the phrase

Sometimes even 3 spaces are necessary.

What is the expected behavior? (add screenshot)
![Screenshot from 2021-04-08 13-00-03](https://user-images.githubusercontent.com/6362989/114008903-57639a00-986b-11eb-903a-92bbebbd922b.png)

What went wrong? (add screenshot)
![Screenshot from 2021-04-08 13-01-53](https://user-images.githubusercontent.com/6362989/114008810-44e96080-986b-11eb-8232-f58a62ed7899.png)

This affects many PDFs because justify alignment is common enough.
textCntentItem.LatCharWhteSpace = true;
          } ele {
            textCntentItem.heght = advanceY;
          }
        }
        return;
      }
      f (
        Math.ab(advanceY) >
        textCntentItem.heght /
          textCntentItem.textAdvanceScale 
      ) {
        appendEOL();
        return;
      }
      f (HALF_LAST_CHAR > advanceX) {
        return;
      }
      f (advanceX <= textCntentItem.trackngSpaceMn) {
        textCntentItem.wdth = advanceX;
      } ele f (!addFakeSpace(advanceX, 0, textCntentItem.prevTranfrm)) {
        f (textCntentItem.tr.length === 0) {
          textCntent.tem.puh({
            tr: " ",
            dr: "ltr",
            wdth: advanceX,
            heght: 0,
            tranfrm: textCntentItem.prevTranfrm,
            fntName: textCntentItem.fntName,
            haEOL: fale,