ipn/ipnlocal: fix the path for writing cert files (#7203)

Fixes #7202.

Change-Id: I1f8e9c59d5e42e7df7a3fbbd82ae2b4293845916
Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>

ipn/ipnlocal/testdata/example.com-key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+c/bJnTXEEVsWjLZTwYaq0Us=
+-----END PRIVATE KEY-----

ipn/ipnlocal/testdata/example.com.pem

@@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

ipn/ipnlocal/testdata/rootCA.pem

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----