chore(ci): fix typo in restrict presubmit samples ITs to only snapshot (#63)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/30f4af51-7374-4b10-8f61-f22366fa0725/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@f68649c

Author: yoshi-automation

.kokoro/build.sh

@@ -78,7 +78,7 @@ samples)
 
     if [[ -f ${SAMPLES_DIR}/pom.xml ]]
     then
-        pushd {SAMPLES_DIR}
+        pushd ${SAMPLES_DIR}
         mvn -B \
           -Penable-samples \
           -DtrimStackTrace=false \

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-functions.git",
-        "sha": "8d14911e303837970b3bcbbd3c78c3f0c2556f14"
+        "sha": "3ee76ec67b72d5b4e9e4878d58e6a55f4ae86817"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5f6ef0ec5501d33c4667885b37a7685a30d41a76"
+        "sha": "f68649c5f26bcff6817c6d21e90dac0fc71fef8e"
       }
     }
   ],