Fix unusual indentation

We have a few instances of strange indentation:

- Incorrect number of characters
- Usage of neither "Block" style or "View" style (elect to use "Block")

src/blockdata/opcodes.rs

@@ -860,8 +860,8 @@ impl Ordinary {
     /// Encode as a byte
     #[inline]
     pub fn into_u8(self) -> u8 {
-      self as u8
-  }
+        self as u8
+    }
 }
 
 #[cfg(test)]

src/consensus/encode.rs

@@ -570,8 +570,8 @@ macro_rules! impl_vec {
             fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, Error> {
                 let len = VarInt::consensus_decode(&mut d)?.0;
                 let byte_size = (len as usize)
-                                    .checked_mul(mem::size_of::<$type>())
-                                    .ok_or(self::Error::ParseFailed("Invalid length"))?;
+                    .checked_mul(mem::size_of::<$type>())
+                    .ok_or(self::Error::ParseFailed("Invalid length"))?;
                 if byte_size > MAX_VEC_SIZE {
                     return Err(self::Error::OversizedVectorAllocation { requested: byte_size, max: MAX_VEC_SIZE })
                 }

src/util/base58.rs

@@ -293,10 +293,10 @@ mod tests {
         // Addresses
         let addr = Vec::from_hex("00f8917303bfa8ef24f292e8fa1419b20460ba064d").unwrap();
         assert_eq!(&check_encode_slice(&addr[..]), "1PfJpZsjreyVrqeoAfabrRwwjQyoSQMmHH");
-      }
+    }
 
-      #[test]
-      fn test_base58_decode() {
+    #[test]
+    fn test_base58_decode() {
         // Basics
         assert_eq!(from("1").ok(), Some(vec![0u8]));
         assert_eq!(from("2").ok(), Some(vec![1u8]));

src/util/bip32.rs

@@ -486,11 +486,11 @@ impl fmt::Display for Error {
 #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
 impl error::Error for Error {
     fn cause(&self) -> Option<&dyn error::Error> {
-       if let Error::Secp256k1(ref e) = *self {
-           Some(e)
-       } else {
-           None
-       }
+        if let Error::Secp256k1(ref e) = *self {
+            Some(e)
+        } else {
+            None
+        }
     }
 }