Removed platform signing from icon pack victor

Fixes: 162480130
Test: no test required
Change-Id: I4c01de14340f1801f21abd56cd5557f9f47e08b1
(cherry picked from commit f1f8c6defc61284b739ac2f9e194546965149174)
diff --git a/packages/overlays/IconPackVictorThemePickerOverlay/Android.bp b/packages/overlays/IconPackVictorThemePickerOverlay/Android.bp
index a18ebb3..690d0a0 100644
--- a/packages/overlays/IconPackVictorThemePickerOverlay/Android.bp
+++ b/packages/overlays/IconPackVictorThemePickerOverlay/Android.bp
@@ -26,6 +26,5 @@
 runtime_resource_overlay {
     name: "IconPackVictorThemePickerOverlay",
     theme: "IconPackVictorThemePicker",
-    certificate: "platform",
     product_specific: true,
 }