renamed "thisexpr" to "this_expr"

javascript/ql/src/semmle/javascript/Expr.qll

@@ -473,7 +473,7 @@ class RegExpLiteral extends @regexp_literal, Literal, RegExpParent {
  * this
  * ```
  */
-class ThisExpr extends @thisexpr, Expr {
+class ThisExpr extends @this_expr, Expr {
   override predicate isImpure() { none() }
 
   /**

javascript/ql/src/semmlecode.javascript.dbscheme

@@ -242,7 +242,7 @@ case @expr.kind of
 |  3 = @number_literal
 |  4 = @string_literal
 |  5 = @regexp_literal
-|  6 = @thisexpr
+|  6 = @this_expr
 |  7 = @arrayexpr
 |  8 = @objexpr
 |  9 = @function_expr

javascript/ql/src/semmlecode.javascript.dbscheme.stats

@@ -214,7 +214,7 @@
 <v>2773</v>
 </e>
 <e>
-<k>@thisexpr</k>
+<k>@this_expr</k>
 <v>128651</v>
 </e>
 <e>