Remove dead code for scanning key providers by type

This code has never been used.

Author: jeltz

contrib/pg_tde/src/catalog/tde_keyring.c

@@ -44,7 +44,6 @@ typedef enum ProviderScanType
 {
 	PROVIDER_SCAN_BY_NAME,
 	PROVIDER_SCAN_BY_ID,
-	PROVIDER_SCAN_BY_TYPE,
 	PROVIDER_SCAN_ALL
 } ProviderScanType;
 
@@ -671,11 +670,6 @@ scan_key_provider_file(ProviderScanType scanType, void *scanKey, Oid dbOid)
 			if (provider.provider_id == *(int *) scanKey)
 				match = true;
 		}
-		else if (scanType == PROVIDER_SCAN_BY_TYPE)
-		{
-			if (provider.provider_type == *(ProviderType *) scanKey)
-				match = true;
-		}
 		else if (scanType == PROVIDER_SCAN_ALL)
 			match = true;