Fix typo in ResultMetadataType.java

[eltociear]

identifer -> identifier

[srowen]

Ok, do you see any more? If you have a spell check going that's great.

[codecov]

Codecov Report

Merging #1410 (ad5d0db) into master (32331c0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1410   +/-   ##
=========================================
  Coverage     79.26%   79.26%           
  Complexity     4367     4367           
=========================================
  Files           251      251           
  Lines         14643    14643           
  Branches       3017     3017           
=========================================
  Hits          11607    11607           
  Misses         2152     2152           
  Partials        884      884           

Impacted Files	Coverage Δ
...main/java/com/google/zxing/ResultMetadataType.java	100.00% <ø> (ø)

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