Revert "test: increate the memory limit to TestRunWithMemoryswap2x"

[Ace-Tang]

This reverts commit 69e6356.

Ⅰ. Describe what this PR did

Thank for the wonderful work in opencontainers/runc#1984 slove this problem with bind way, by the way, it also sloved the kernel limit problem in opencontainers/runc#1979

After alibaba-archive/runc#20 merged, we can revert the change in TestRunWithMemoryswap2x.

/cc @fuweid

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2737 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2737      +/-   ##
==========================================
+ Coverage   69.31%   69.32%   +<.01%     
==========================================
  Files         278      278              
  Lines       17442    17442              
==========================================
+ Hits        12090    12091       +1     
+ Misses       4025     4024       -1     
  Partials     1327     1327

Flag	Coverage Δ
#criv1alpha2_test	39.48% <ø> (+0.08%)	⬆️
#integration_test_0	36.59% <ø> (-0.05%)	⬇️
#integration_test_1	35.46% <ø> (-0.04%)	⬇️
#integration_test_2	36.55% <ø> (+0.01%)	⬆️
#integration_test_3	35.42% <ø> (ø)	⬆️
#node_e2e_test	35.32% <ø> (+0.03%)	⬆️
#unittest	28.44% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
ctrd/container.go	56.51% <0%> (-1.15%)	⬇️
daemon/mgr/container.go	60.58% <0%> (-0.21%)	⬇️
cri/v1alpha2/cri.go	71.59% <0%> (+0.12%)	⬆️
pkg/streams/utils.go	91.66% <0%> (+2.38%)	⬆️
cri/ocicni/cni_manager.go	70.58% <0%> (+11.76%)	⬆️

[fuweid]

LGTM