fix: Prevent crash on clicking Scan QR FAB

[ShridharGoel]

Fixes #1558

Checklist:

• I have checked for PMD and check-style issues
• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.

Changes:

Added check for camera permission before initializing camera source. Now app would not crash and permissions would be sought properly.

[codecov]

Codecov Report

Merging #1559 into development will decrease coverage by 0.01%.
The diff coverage is 0%.

@@               Coverage Diff                @@
##             development   #1559      +/-   ##
================================================
- Coverage          24.81%   24.8%   -0.02%     
  Complexity           800     800              
================================================
  Files                238     238              
  Lines               8957    8962       +5     
  Branches             367     367              
================================================
  Hits                2223    2223              
- Misses              6650    6655       +5     
  Partials              84      84

Impacted Files	Coverage Δ	Complexity Δ
...organizer/core/attendee/qrscan/ScanQRActivity.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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[ShridharGoel]

@iamareebjamal @Masquerade0097 Please review.