Fix icon clipping in installing apps list

Alexander Smoliyaninovrequested to merge
alexsmolya/fdroidclient:fix-3289-installing-icon-clipping into master

The app icon in the My Apps Installing section was not clipped like the equivalent app-list icon, making the same icon appear inconsistently.

Apply MaterialTheme.shapes.medium clipping to InstallingAppRow's 48.dp icon, matching AppListRow.

Closes #3289

Validation:

  • ./gradlew :app:ktfmtCheck
  • ./gradlew :app:compileBasicDefaultDebugKotlin

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