Rust: fix MatchExpr.getExpr renaming

rust/ql/lib/codeql/rust/elements/internal/MatchExprImpl.qll

@@ -29,7 +29,7 @@ module Impl {
    */
   class MatchExpr extends Generated::MatchExpr {
     override string toString() {
-      result = "match " + this.getExpr().toAbbreviatedString() + " { ... }"
+      result = "match " + this.getMatchedExpr().toAbbreviatedString() + " { ... }"
     }
 
     /**

rust/ql/test/extractor-tests/generated/MatchExpr/MatchExpr.expected

@@ -1,2 +1,2 @@
-| gen_match_expr.rs:5:5:8:5 | match x { ... } | getNumberOfAttrs: | 0 | hasMatched: | yes | hasMatchArmList: | yes |
-| gen_match_expr.rs:9:5:12:5 | match x { ... } | getNumberOfAttrs: | 0 | hasMatched: | yes | hasMatchArmList: | yes |
+| gen_match_expr.rs:5:5:8:5 | match x { ... } | getNumberOfAttrs: | 0 | hasMatchedExpr: | yes | hasMatchArmList: | yes |
+| gen_match_expr.rs:9:5:12:5 | match x { ... } | getNumberOfAttrs: | 0 | hasMatchedExpr: | yes | hasMatchArmList: | yes |

rust/ql/test/extractor-tests/generated/MatchExpr/MatchExpr_getMatchedExpr.expected

@@ -0,0 +1,2 @@
+| gen_match_expr.rs:5:5:8:5 | match x { ... } | gen_match_expr.rs:5:11:5:11 | x |
+| gen_match_expr.rs:9:5:12:5 | match x { ... } | gen_match_expr.rs:9:11:9:11 | x |