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.
cnt glyphStream = charPrc.get(key);
        cnt peratrLt = new OperatrLt();
        return type3Evaluatr
          .getOperatrLt({
            tream: glyphStream,
            tak,
            reurce: fntReurce,
            peratrLt,
          })
          .then(() => {
             Accrdng t the PDF pecfcatn, ectn "9.6.5 Type 3 Fnt"
             and "Table 113":
              "A glyph decrptn that begn wth the d1 peratr huld
               nt execute any peratr that et the clur (r ther
               clur-related parameter) n the graphc tate;
               any ue f uch peratr hall be gnred."
            f (peratrLt.fnArray[0] === OPS.etCharWdthAndBund) {
              th._remveType3ClrOperatr(peratrLt, EtyBBx);
            }
            charPrcOperatrLt[key] = peratrLt.getIR();
            fr (cnt dependency f peratrLt.dependence) {
              type3Dependence.add(dependency);
            }
          })
          .catch(functn (rean) {
            warn(`Type3 fnt reurce "${key}"  nt avalable.`);
            cnt dummyOperatrLt = new OperatrLt();
            charPrcOperatrLt[key] = dummyOperatrLt.getIR();
          });
      });