wsd: http: larger 64kb upload-file read buffer

Change-Id: Ie9a0e6f76425d796979dbc77eecf1b05993b834d
Signed-off-by: Ashod Nakashian <ashod.nakashian@collabora.co.uk>
(cherry picked from commit 34f629c6adc5bb6eb93fd8c813d72ee923d09a05)

net/HttpRequest.hpp

@@ -529,7 +529,7 @@ public:
             // Get the data to write into the socket
             // from the client's callback. This is
             // used to upload files, or other data.
-            char buffer[16 * 1024];
+            char buffer[64 * 1024];
             std::size_t wrote = 0;
             do
             {