Apply suggestions from code review

Co-Authored-By: Nicolas Stucki <nicolas.stucki@gmail.com>

Author: Aggelos Biboudis

tests/run-macros/quote-matcher-power/Macro_1.scala

@@ -5,11 +5,11 @@ object Macros {
 
   def power_s(x: Expr[Double], n: Int)(given QuoteContext): Expr[Double] =
     if (n == 0) '{1.0}
-    else if (n % 2 == 1) '{ ${x} * ${power_s(x, n - 1)} }
-    else '{ val y = $x * $x; ${power_s('{y}, n / 2)} }
+    else if (n % 2 == 1) '{ $x * ${power_s(x, n - 1)} }
+    else '{ val y = $x * $x; ${power_s('y, n / 2)} }
 
   inline def power(x: Double, inline n: Int): Double =
-    ${power_s('{x}, n)}
+    ${power_s('x, n)}
 
   def power2(x: Double, y: Double): Double = if y == 0.0 then 1.0 else x * power2(x, y - 1.0)