Swift: remove emoji in test

Author: redsun82

swift/ql/test/extractor-tests/generated/expr/PostfixUnaryExpr/PostfixUnaryExpr.expected

@@ -1,2 +1,2 @@
 | postfix.swift:1:5:1:6 | call to ...(_:) | getFunction: | postfix.swift:1:6:1:6 | ....(_:) |
-| postfix.swift:7:1:7:2 | call to \u2757(_:) | getFunction: | postfix.swift:7:2:7:2 | \u2757(_:) |
+| postfix.swift:7:1:7:2 | call to **(_:) | getFunction: | postfix.swift:7:2:7:2 | **(_:) |

swift/ql/test/extractor-tests/generated/expr/PostfixUnaryExpr/PostfixUnaryExpr_getArgument.expected

@@ -1,2 +1,2 @@
 | postfix.swift:1:5:1:6 | call to ...(_:) | 0 | postfix.swift:1:5:1:5 | : 3 |
-| postfix.swift:7:1:7:2 | call to \u2757(_:) | 0 | postfix.swift:7:1:7:1 | : 3 |
+| postfix.swift:7:1:7:2 | call to **(_:) | 0 | postfix.swift:7:1:7:1 | : 3 |

swift/ql/test/extractor-tests/generated/expr/PostfixUnaryExpr/PostfixUnaryExpr_getType.expected

@@ -1,2 +1,2 @@
 | postfix.swift:1:5:1:6 | call to ...(_:) | PartialRangeFrom<Int> |
-| postfix.swift:7:1:7:2 | call to \u2757(_:) | () |
+| postfix.swift:7:1:7:2 | call to **(_:) | () |

swift/ql/test/extractor-tests/generated/expr/PostfixUnaryExpr/postfix.swift

@@ -1,7 +1,7 @@
 _ = 3...
 
-postfix operator ❗
+postfix operator **
 
-postfix func ❗(_ n: Int) {}
+postfix func **(_ n: Int) {}
 
-3❗
+3**