AC-619: Fix window leakage error while viewing patient details

[deepak140596]

Description of what I changed

Removed the line that set TextView text to "None". Only visibility needed to be checked. The text was already set.

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-619

Checklist: I completed these to help reviewers :)

• My pull request only contains ONE single commit
  (the number above, next to the 'Commits' tab is 1).

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

• All new and existing tests passed.

• My pull request is based on the latest changes of the master branch.

[codecov-io]

Codecov Report

Merging #623 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #623      +/-   ##
=========================================
+ Coverage    14.3%   14.3%   +<.01%     
=========================================
  Files         202     202              
  Lines        9212    9211       -1     
  Branches      791     791              
=========================================
  Hits         1318    1318              
+ Misses       7813    7812       -1     
  Partials       81      81

Impacted Files	Coverage Δ
...patientdashboard/vitals/PatientVitalsFragment.java	0% <ø> (ø)	⬆️

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