fix: filter limit constant

[igorbernstein2]

Should be 20 KB not 20 MB
https://cloud.google.com/bigtable/quotas#row-filters

[mutianf]

LGTM

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[mutianf]

Looks like the test also needs to be updated:

[INFO] Running com.google.cloud.bigtable.data.v2.models.QueryTest
Error:  Tests run: 13, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.579 s <<< FAILURE! - in com.google.cloud.bigtable.data.v2.models.QueryTest
Error:  com.google.cloud.bigtable.data.v2.models.QueryTest.filterTestWithExceptions  Time elapsed: 0.563 s  <<< FAILURE!
value of           : throwable.getMessage()
expected to contain: filter size can't be more than 20MB
but was            : filter size can't be more than 20KB
	at com.google.cloud.bigtable.data.v2.models.QueryTest.filterTestWithExceptions(QueryTest.java:134)
Caused by: java.lang.IllegalArgumentException: filter size can't be more than 20KB
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:144)
	at com.google.cloud.bigtable.data.v2.models.Query.filter(Query.java:172)

[codecov]

Codecov Report

Merging #787 (15b5060) into master (f937a18) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #787      +/-   ##
============================================
+ Coverage     83.44%   83.49%   +0.05%     
- Complexity     1311     1315       +4     
============================================
  Files           114      114              
  Lines          7799     7806       +7     
  Branches        442      446       +4     
============================================
+ Hits           6508     6518      +10     
+ Misses         1036     1033       -3     
  Partials        255      255              

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/bigtable/data/v2/models/Query.java	68.80% <100.00%> (ø)	27.00 <0.00> (ø)
...om/google/cloud/bigtable/emulator/v2/Emulator.java	60.65% <0.00%> (+0.81%)	14.00% <0.00%> (ø%)
.../bigtable/admin/v2/models/RestoreTableRequest.java	82.85% <0.00%> (+4.28%)	10.00% <0.00%> (+3.00%)
...ata/v2/stub/metrics/HeaderTracerUnaryCallable.java	100.00% <0.00%> (+10.52%)	3.00% <0.00%> (+1.00%)

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