Revert "Possible fix for #168 - Always create new instance of col"

[elifarley]

Reverts #169

Failed tests: 
com.jsoniter.TestExisting.test_reuse_linked_list(com.jsoniter.TestExisting)
  Run 1: TestExisting.test_reuse_linked_list:61 expected:<1753447031> but was:<1810132623>
  Run 2: PASS
  Run 3: PASS
  Run 4: TestExisting.test_reuse_linked_list:61 expected:<764577347> but was:<1344645519>
com.jsoniter.TestExisting.test_reuse_list(com.jsoniter.TestExisting)
  Run 1: TestExisting.test_reuse_list:54 expected:<745160567> but was:<610984013>
  Run 2: PASS
  Run 3: PASS
  Run 4: TestExisting.test_reuse_list:54 expected:<1458540918> but was:<1164371389>

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Codecov Report

❗ No coverage uploaded for pull request base (master@42a3e08). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #171   +/-   ##
=========================================
  Coverage          ?   68.04%           
=========================================
  Files             ?      107           
  Lines             ?     7301           
  Branches          ?     1379           
=========================================
  Hits              ?     4968           
  Misses            ?     1881           
  Partials          ?      452

Impacted Files	Coverage Δ
...java/com/jsoniter/ReflectionCollectionDecoder.java	61.9% <100%> (ø)

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