Fix IE11 for in bug in motor field (#513)
* Fix IE11 for in bug in motor field * minor fix
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		@@ -406,7 +406,7 @@ export class FieldMotors extends Blockly.FieldDropdown implements Blockly.FieldC
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        let opts = {};
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        let conts = {};
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        let vals = {};
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        for (let opt in options) {
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        for (let opt = 0; opt < options.length; opt++) {
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            let text = options[opt][0].alt ? options[opt][0].alt : options[opt][0];
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            if (text.indexOf(' ') == -1) {
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                // Patch dual motors as they don't have prefixes.
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