#3613 fixing off-by-one error on compiler errors (#3692)
#3613 fixing off-by-one error on compiler errors (#3692)

As both the python filename array and the Input_X indexing is 0 based, the `-1` operation is not needed.

fromFileArray in closure-compiler uses 0 based indexing. see:

https://github.com/google/closure-compiler/blob/09cca3b536923dfb86d4e2ea34c8ee97d3ab471c/src/com/google/javascript/jscomp/gwt/client/JsRunnerMain.java#L816
rachel-fenichel/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,mark-friedman/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,rachel-fenichel/blockly,mark-friedman/blockly,rachel-fenichel/blockly,mark-friedman/blockly,mark-friedman/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,rachel-fenichel/blockly,google/blockly