Return exit code 1 when not all errors are fixed

[nulls]

What's done:

• calculate only not fixed errors
• return 1 when there are errors

[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   6m 32s ⏱️ + 1m 33s
1 426 tests ±0  1 382 ✔️  - 6  38 💤 ±0  6 ❌ +6 
2 805 runs  ±0  2 761 ✔️  - 6  38 💤 ±0  6 ❌ +6 

For more details on these failures, see this check.

Results for commit 45acaca. ± Comparison against base commit 8b44e13.

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   7m 21s ⏱️ -10s
1 426 tests ±0  1 403 ✔️  - 6  17 💤 ±0  6 ❌ +6 
2 805 runs  ±0  2 782 ✔️  - 6  17 💤 ±0  6 ❌ +6 

For more details on these failures, see this check.

Results for commit 45acaca. ± Comparison against base commit 8b44e13.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (3ba0fb0) 78.42% compared to head (348c702) 78.40%.

Files	Patch %	Lines
...c/main/kotlin/com/saveourtool/diktat/DiktatMain.kt	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1868      +/-   ##
============================================
- Coverage     78.42%   78.40%   -0.02%     
  Complexity     2465     2465              
============================================
  Files           134      134              
  Lines          8695     8697       +2     
  Branches       2199     2200       +1     
============================================
  Hits           6819     6819              
- Misses          897      899       +2     
  Partials        979      979              

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