fix: ScopeQuery should be case sensitive (#1168)

[suninuni]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

#1168

arg_xxx in APISIX is case sensitive, so ScopeQuery don't need being translated to lower case.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[suninuni]

@tao12345666333

[tao12345666333]

LGTM

[codecov-commenter]

Codecov Report

Merging #1188 (101fe58) into master (a0bc739) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1188   +/-   ##
=======================================
  Coverage   29.98%   29.98%           
=======================================
  Files          81       81           
  Lines        9979     9979           
=======================================
  Hits         2992     2992           
  Misses       6663     6663           
  Partials      324      324           

Impacted Files	Coverage Δ
pkg/kube/translation/apisix_route.go	20.60% <100.00%> (ø)

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