[MINI-5882] Fix back operation on top page

[munir-rakuten]

Added condition on back button press when at top page. Application will be close if user is at the top page and press device's back button.

Links

MINI-5882

Checklist

• [x] I have read the contributing guidelines.
• [x] I have completed the SDK Development Learning Path (if submitting a feature PR)
• [x] I removed all sensitive data before every commit, including API endpoints and keys
• [x] I ran ./gradlew check without errors

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.4% Duplication

[codecov[bot]]

Codecov Report

Merging #552 (aa3b8d6) into master (98de909) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #552   +/-   ##
=======================================
  Coverage   82.52%   82.52%           
=======================================
  Files          88       88           
  Lines        3755     3755           
  Branches      514      514           
=======================================
  Hits         3099     3099           
  Misses        337      337           
  Partials      319      319           

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