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

googleapis#289)

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Source-Link: googleapis/synthtool@f68649c

java-resourcemanager/.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 \

java-resourcemanager/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "e13dd707347ab38ca998c8148a4ee9b46c7cb5ee"
+        "sha": "d0df733670db2d5a56cf5960bfde90a519d05e52"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5f6ef0ec5501d33c4667885b37a7685a30d41a76"
+        "sha": "f68649c5f26bcff6817c6d21e90dac0fc71fef8e"
       }
     }
   ],