refactor(android): guard selection color setters against no-op writes

Author: hryhoriiK97

android/src/main/java/com/swmansion/enriched/markdown/EnrichedMarkdown.kt

@@ -132,11 +132,13 @@ class EnrichedMarkdown
     }
 
     fun setSelectionColor(color: Int?) {
+      if (selectionColor == color) return
       selectionColor = color
       applySelectionColorsToSegments()
     }
 
     fun setSelectionHandleColor(color: Int?) {
+      if (selectionHandleColor == color) return
       selectionHandleColor = color
       applySelectionColorsToSegments()
     }

android/src/main/java/com/swmansion/enriched/markdown/EnrichedMarkdownText.kt

@@ -265,11 +265,13 @@ class EnrichedMarkdownText
     }
 
     fun setSelectionColor(color: Int?) {
+      if (selectionColor == color) return
       selectionColor = color
       applySelectionColors(selectionColor, selectionHandleColor)
     }
 
     fun setSelectionHandleColor(color: Int?) {
+      if (selectionHandleColor == color) return
       selectionHandleColor = color
       applySelectionColors(selectionColor, selectionHandleColor)
     }