Load inputShapes in the loadMetadata method of Linear block

[KexinFeng]

This aims to solve the issue #2446
As pointed out there in the issue, the loadMetadata method in Linear missed the inputShapes (plural). In this PR it is added.

[codecov-commenter]

Codecov Report

Patch coverage: 75.35% and project coverage change: +1.92 🎉

Comparison is base (bb5073f) 72.08% compared to head (49d9650) 74.01%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2448      +/-   ##
============================================
+ Coverage     72.08%   74.01%   +1.92%     
- Complexity     5126     6801    +1675     
============================================
  Files           473      672     +199     
  Lines         21970    29680    +7710     
  Branches       2351     3062     +711     
============================================
+ Hits          15838    21967    +6129     
- Misses         4925     6225    +1300     
- Partials       1207     1488     +281     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/BaseModel.java	75.83% <0.00%> (+1.86%)	⬆️
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
...rc/main/java/ai/djl/modality/cv/output/Joints.java	71.42% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...main/java/ai/djl/modality/cv/output/Rectangle.java	72.41% <0.00%> (ø)
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <0.00%> (-5.24%)	⬇️
.../modality/cv/translator/ImageFeatureExtractor.java	0.00% <0.00%> (ø)
.../ai/djl/modality/cv/translator/YoloTranslator.java	27.77% <0.00%> (+18.95%)	⬆️
...ain/java/ai/djl/modality/cv/util/NDImageUtils.java	67.10% <0.00%> (+7.89%)	⬆️
... and 642 more

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