Codechange: Reduce size of TextEffectMode and TextEffectID.

TextEffectID was promoted to size_t in #9235, when it was used in loops.
However since then the relevant code uses range-for or iterators instead.

src/texteff.hpp

@@ -17,12 +17,12 @@
 /**
  * Text effect modes.
  */
-enum TextEffectMode {
+enum TextEffectMode : uint8_t {
 	TE_RISING, ///< Make the text effect slowly go upwards
 	TE_STATIC, ///< Keep the text effect static
 };
 
-typedef size_t TextEffectID;
+using TextEffectID = uint16_t;
 
 static const TextEffectID INVALID_TE_ID = UINT16_MAX;