Math.sign -> Math.sin (#2802)
Math.sign -> Math.sin (#2802)

There was a typo at some point.
picklesrus/blockly,google/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,google/blockly,google/blockly,mark-friedman/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,mark-friedman/blockly,rachel-fenichel/blockly,mark-friedman/blockly,picklesrus/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,picklesrus/blockly,mark-friedman/blockly