Revert "Removed airline logos and replace placeholder path"

This reverts commit 8d91dad.

Author: BlitzCityDIY

MatrixPortal_S3_Flight_Proximity_Tracker/code.py

@@ -33,7 +33,7 @@
 
 GAP_BETWEEN_ICONS = 15  # Gap between the icons
 NUMBER_OF_ICONS = 2  # Number of icons to display
-PLACEHOLDER_ICON_PATH = "/placeholder_image/placeholder.bmp"
+PLACEHOLDER_ICON_PATH = "/airline_logos/placeholder.bmp"
 
 # --- Text Properties ---
 TEXT_START_X = ICON_WIDTH + 4