AEC3: Corrected the reading/creation of the json parameter file
AEC3: Corrected the reading/creation of the json parameter file

Bug: webrtc:8671
Change-Id: Ide8693b3be023e56d3acca38e703c95ba0e9b69b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133623
Reviewed-by: Sam Zackrisson <b1a93beadfe1d2f7f0106ee02b6ffcdc950aa103@webrtc.org>
Commit-Queue: Per Åhgren <3616c2c8a2c30a769c5419f89b4a810ea6e2f079@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27714}
TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc