fix: init temp writable uri

[Garzas]

---

PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

---

What's new in this PR?

After splitting MessageComposerViewModel I by mistake removed initialisation functions for temp file for camera and video

[yamilmedina]

❤️

[github-actions]

Test Results

878 tests  ±0   878 ✅ ±0   13m 47s ⏱️ + 1m 31s
120 suites ±0     0 💤 ±0 
120 files   ±0     0 ❌ ±0 

Results for commit 2728037. ± Comparison against base commit bee00f0.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.84%. Comparing base (bee00f0) to head (2728037).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2837      +/-   ##
===========================================
+ Coverage    43.78%   43.84%   +0.05%     
===========================================
  Files          422      422              
  Lines        14034    14044      +10     
  Branches      2537     2537              
===========================================
+ Hits          6145     6157      +12     
+ Misses        7169     7167       -2     
  Partials       720      720              

Files	Coverage Δ
...conversations/composer/MessageComposerViewModel.kt	76.31% <100.00%> (+3.58%)	⬆️

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bee00f0...2728037. Read the comment docs.

[github-actions]

APKs built during tests are available here. Scroll down to Artifacts!

[AndroidBob]

Build 3832 failed.