Deps: Remove androidx compose ui tooling preview dep from media ph

This dependency is completely unused.

FYI: It got introduced as part of this
(7d8d37c) commit, a part of
implementing placeholders in compose.

------------------------------------------------------------------------

This removal was suggested by the dependency analysis report, see below:

Advice for :media-placeholders
Unused dependencies which should be removed:
  ...
  implementation 'androidx.compose.ui:ui-tooling-preview:1.7.5'

Author: ParaskP7

media-placeholders/build.gradle

@@ -49,7 +49,6 @@ dependencies {
     testImplementation "org.robolectric:robolectric:$robolectricVersion"
     implementation "androidx.compose.foundation:foundation:$androidxComposeLibraryVersion"
     implementation "androidx.compose.ui:ui:$androidxComposeLibraryVersion"
-    implementation "androidx.compose.ui:ui-tooling-preview:$androidxComposeLibraryVersion"
 }
 
 dependencyAnalysis {