fix (filebrowser): minified filebrowser json file

src/main.cpp

@@ -488,15 +488,15 @@ void appendNodeToJSONFile(fs::FS &fs, const char * path, const char *filename, c
     //TODO: write a minified json, without all those whitespaces
     //      it is just easier to debug when json is in a nice format
     //      anyway ugly but works and is stable
-    file.print(F(( "  {\n     \"id\" : \"")));
+    file.print(F("{\"id\":\""));
     file.print(filename);
-    file.print(F("\",\n     \"parent\" : \""));
+    file.print(F("\",\"parent\":\""));
     file.print(parent);
-    file.print(F("\",\n    \"type\": \""));
+    file.print(F("\",\"type\":\""));
     file.print(type);
-    file.print(F("\",\n   \"text\" : \""));
+    file.print(F("\",\"text\":\""));
     file.print(filename);
-    file.print(F("\"\n  }"));
+    file.print(F("\"}"));
     // i/o is timing critical keep all stuff running
     esp_task_wdt_reset();
     yield();
@@ -598,7 +598,7 @@ void parseSDFileList(fs::FS &fs, const char * dirname, const char * parent, uint
  *  is done.
  */
 void createJSONFileList() {
-    createFile(SD, DIRECTORY_INDEX_FILE, "[\n");
+    createFile(SD, DIRECTORY_INDEX_FILE, "[");
     parseSDFileList(SD,  "/", NULL, FS_DEPTH);
     appendToFile(SD, DIRECTORY_INDEX_FILE, "]");
     isFirstJSONtNode  =  true;