fix: morphTo when relation name is in camel case

[divine]

Recreating #2318 as I don't have permission to resolve merge conflicts.

[codecov-commenter]

Codecov Report

Base: 88.12% // Head: 88.18% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (db72c17) compared to base (6aa6ad1).
Patch coverage: 89.43% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2498      +/-   ##
============================================
+ Coverage     88.12%   88.18%   +0.06%     
- Complexity      664      697      +33     
============================================
  Files            33       32       -1     
  Lines          1566     1701     +135     
============================================
+ Hits           1380     1500     +120     
- Misses          186      201      +15     

Impacted Files	Coverage Δ
src/Auth/PasswordResetServiceProvider.php	33.33% <ø> (ø)
src/Eloquent/EmbedsRelations.php	100.00% <ø> (ø)
src/Helpers/QueriesRelationships.php	91.37% <ø> (-1.85%)	⬇️
src/Queue/Failed/MongoFailedJobProvider.php	21.05% <ø> (ø)
src/Queue/MongoConnector.php	100.00% <ø> (ø)
src/Queue/MongoJob.php	100.00% <ø> (ø)
src/Queue/MongoQueue.php	100.00% <ø> (ø)
src/Relations/BelongsToMany.php	86.53% <ø> (+0.39%)	⬆️
src/Relations/EmbedsOne.php	95.45% <ø> (ø)
src/Relations/EmbedsOneOrMany.php	98.14% <ø> (ø)
... and 29 more

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