Fix reading cached elevation files

[leonardehrenfried]

When trying out the cached elevation file feature introduced by @evansiroky a while back, the following exception stopped my graph build.

java.util.UnknownFormatConversionException: Conversion = ')'
         at java.base/java.util.Formatter.checkText(Formatter.java:2732) ~[na:na]
         at java.base/java.util.Formatter.parse(Formatter.java:2718) ~[na:na]
         at java.base/java.util.Formatter.format(Formatter.java:2655) ~[na:na]
         at java.base/java.util.Formatter.format(Formatter.java:2609) ~[na:na]
         at java.base/java.lang.String.format(String.java:2897) ~[na:na]
         at org.opentripplanner.graph_builder.issues.Graphwide.getMessage(Graphwide.java:15) ~[otp-shaded.jar:1.1]
         at org.opentripplanner.graph_builder.DataImportIssueStore.add(DataImportIssueStore.java:24) ~[otp-shaded.jar:1.1]
         at org.opentripplanner.graph_builder.module.ned.ElevationModule.buildGraph(ElevationModule.java:226) ~[otp-shaded.jar:1.1]
         at org.opentripplanner.graph_builder.GraphBuilder.run(GraphBuilder.java:80) ~[otp-shaded.jar:1.1]
         at org.opentripplanner.standalone.OTPMain.startOTPServer(OTPMain.java:136) ~[otp-shaded.jar:1.1]
         at org.opentripplanner.standalone.OTPMain.main(OTPMain.java:52) ~[otp-shaded.jar:1.1]

String.format is running into trouble however that function is totally unnecessary and can be removed without replacement.

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