YARN-10469. YARN-UI2 The accuracy of the percentage values in the same chart on the YARN 'Cluster OverView' page are inconsistent

[echohlne]

JIRA: https://issues.apache.org/jira/browse/YARN-10469

Ensure the accuracy of the percentage values in the same chart on the YARN 'Cluster OverView' page are consistent
just a small improvement.

before modified, the cluster overview page shows like this:

After modified, the manual test results are as follows:

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 35s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	31m 23s		trunk passed
+1 💚	shadedclient	46m 17s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 13s		the patch passed
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	14m 48s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 32s		The patch does not generate ASF License warnings.
		64m 16s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2401/1/artifact/out/Dockerfile
GITHUB PR	#2401
JIRA Issue	YARN-10469
Optional Tests	dupname asflicense shadedclient jshint
uname	Linux 88b0502f0282 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 7435604
Max. process+thread count	414 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2401/1/console
versions	git=2.17.1 maven=3.6.0
Powered by	Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org

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[jiwq]

+1 Thanks @akiyamaneko for the contribution.

[echohlne]

@jiwq Is there anyone else who can help review or merge the code? thanks 😁

[jiwq]

@tangzhankun Can you help to review and merge it?

[tangzhankun]

Merged it just now.
@jiwq Thanks for the review.
@akiyamaneko Thanks for the contribution!