Fix remnants of uBO code in cache storage manager

Related feedback:
- https://github.com/uBlockOrigin/uMatrix-issues/issues/227#issuecomment-590543891

src/js/background.js

@@ -57,6 +57,8 @@ const rawSettingsDefault = {
     assetFetchBypassBrowserCache: false,
     assetFetchTimeout: 30,
     autoUpdateAssetFetchPeriod: 120,
+    cacheStorageAPI: 'unset',
+    cacheStorageCompression: true,
     cnameIgnoreList: 'unset',
     cnameIgnore1stParty: true,
     cnameIgnoreExceptions: true,

src/js/cachestorage.js

@@ -119,7 +119,7 @@
                     disconnect();
                 },
                 Math.max(
-                    µMatrix.hiddenSettings.autoUpdateAssetFetchPeriod * 2 * 1000,
+                    µMatrix.rawSettings.autoUpdateAssetFetchPeriod * 2 * 1000,
                     180000
                 )
             );
@@ -296,7 +296,7 @@
             const promises = [ getDb() ];
             const entries = [];
             const dontCompress =
-                µMatrix.hiddenSettings.cacheStorageCompression !== true;
+                µMatrix.rawSettings.cacheStorageCompression !== true;
             const handleEncodingResult = result => {
                 entries.push({ key: result.key, value: result.data });
             };

src/js/start.js

@@ -32,6 +32,11 @@
     ]);
     log.info(`User settings ready ${Date.now()-vAPI.T0} ms after launch`);
 
+    const cacheBackend = await µm.cacheStorage.select(
+        µm.rawSettings.cacheStorageAPI
+    );
+    log.info(`Backend storage for cache will be ${cacheBackend}`);
+
     const shouldWASM =
         vAPI.canWASM === true &&
         µm.rawSettings.disableWebAssembly !== true;