chore: fix typos in src/main/java/com/thealgorithms/backtracking/FloodFill.java

[khanhkhanhlele]

This PR fixes typos in the file src/main/java/com/thealgorithms/backtracking/FloodFill.java.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.31%. Comparing base (5323084) to head (f1e09e6).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7046      +/-   ##
============================================
- Coverage     78.32%   78.31%   -0.01%     
+ Complexity     6656     6655       -1     
============================================
  Files           751      751              
  Lines         22162    22162              
  Branches       4353     4353              
============================================
- Hits          17359    17357       -2     
- Misses         4104     4105       +1     
- Partials        699      700       +1     

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