swf: Avoid some `Vec::resize` usages

Use the `vec![]` macro instead.

core/src/avm2.rs

@@ -318,12 +318,10 @@ impl<'gc> Avm2<'gc> {
     }
 
     fn pop_args(&mut self, arg_count: u32) -> Vec<Value<'gc>> {
-        let mut args = Vec::with_capacity(arg_count as usize);
-        args.resize(arg_count as usize, Value::Undefined);
+        let mut args = vec![Value::Undefined; arg_count as usize];
         for arg in args.iter_mut().rev() {
             *arg = self.pop();
         }
-
         args
     }
 

core/src/avm2/array.rs

@@ -21,11 +21,9 @@ impl<'gc> ArrayStorage<'gc> {
     /// The length parameter indicates how big the array storage should start
     /// out as. All array storage consists of holes.
     pub fn new(length: usize) -> Self {
-        let mut storage = Vec::new();
-
-        storage.resize(length, None);
-
-        Self { storage }
+        Self {
+            storage: vec![None; length],
+        }
     }
 
     /// Convert a set of arguments into array storage.

swf/src/read.rs

@@ -1011,16 +1011,15 @@ impl<'a> Reader<'a> {
         let name = self.read_str_with_len(name_len.into())?;
 
         let num_glyphs = self.read_u16()? as usize;
-        let mut glyphs = Vec::with_capacity(num_glyphs);
-        glyphs.resize(
-            num_glyphs,
+        let mut glyphs = vec![
             Glyph {
                 shape_records: vec![],
                 code: 0,
                 advance: None,
                 bounds: None,
-            },
-        );
+            };
+            num_glyphs
+        ];
 
         // SWF19 p. 164 doesn't make it super clear: If there are no glyphs,
         // then the following tables are omitted. But the table offset values