(#233) DesktopApp: Update proguard rules

[ryanw-mobile]

This updates ProGuard so release builds should be able to access to DB successfully.

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: -0.03% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (f48930df006f03b0d37ebafa9c9e3d3d403bb15b) | 1971 | 1270 | 64.43% | | | Head commit (8e72dc80d5c3ffc21245bd5171c5adcfb1594768) | 1972 (+1) | 1270 (+0) | 64.40% (**-0.03%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#235) | 1 | 1 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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