app/matrix: fix typo in secret in matrix.0x3c.pl

it looks like I have missed a typo

Change-Id: I5cdf06d44d23ab678f239c19d78170d3f1125b9c
diff --git a/app/matrix/matrix.0x3c.pl.jsonnet b/app/matrix/matrix.0x3c.pl.jsonnet
index 7f9a71b..4adceb6 100644
--- a/app/matrix/matrix.0x3c.pl.jsonnet
+++ b/app/matrix/matrix.0x3c.pl.jsonnet
@@ -19,7 +19,7 @@
             enable: true,
             oauth2: {
                 clientID: "YCWg1Qor9YstKn_yAHB_NT3GFAGqbnDFzIwyI_fCUWI",
-                clientSecret: (std.split(importstr "secrets/plain/cas-proxy-0x3c-0auth2-secret", "\n"))[0],
+                clientSecret: (std.split(importstr "secrets/plain/cas-proxy-0x3c-oauth2-secret", "\n"))[0],
                 scope: "read:accounts",
                 authorizeURL: "https://0x3c.pl/oauth/authorize",
                 tokenURL: "https://0x3c.pl/oauth/token",
diff --git a/app/matrix/secrets/cipher/cas-proxy-0x3c-0auth2-secret b/app/matrix/secrets/cipher/cas-proxy-0x3c-oauth2-secret
similarity index 100%
rename from app/matrix/secrets/cipher/cas-proxy-0x3c-0auth2-secret
rename to app/matrix/secrets/cipher/cas-proxy-0x3c-oauth2-secret