fix: fix start index with page size for list rows

[suraj-qlogic]

Fixes #744

[codecov]

Codecov Report

Merging #793 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #793      +/-   ##
============================================
+ Coverage     80.40%   80.42%   +0.02%     
- Complexity     1265     1266       +1     
============================================
  Files            79       79              
  Lines          6532     6534       +2     
  Branches        745      746       +1     
============================================
+ Hits           5252     5255       +3     
+ Misses          889      888       -1     
  Partials        391      391              

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	83.03% <100.00%> (+0.19%)	85.00 <0.00> (+1.00)

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