MOBILE-3188 core: Use usual format in new name of wscache table

src/classes/site.ts

@@ -208,7 +208,7 @@ export class CoreSite {
     protected wsProvider: CoreWSProvider;
 
     // Variables for the database.
-    static WS_CACHE_TABLE = 'ws_cache';
+    static WS_CACHE_TABLE = 'wscache_2';
     static CONFIG_TABLE = 'core_site_config';
 
     // Versions of Moodle releases.

src/providers/sites.ts

@@ -425,7 +425,11 @@ export class CoreSitesProvider {
                     'SELECT id, data, key, expirationTime, NULL as component, NULL as componentId ' +
                     'FROM ' + oldTable);
 
-                return await db.dropTable(oldTable);
+                try {
+                    await db.dropTable(oldTable);
+                } catch (error) {
+                    // Error deleting old table, ignore.
+                }
             }
         }
     };