Card size reported incorrectly for SDHC cards causing SdReadTest to fail.

- Arduino board: Arduino Uno

- Arduino IDE version (found in Arduino -> About Arduino menu): 2.0.0

- List the steps to reproduce the problem below (if possible attach a sketch or
copy the sketch code in too):

Run the SdReadTest example with a 32GB or larger SdCard

```
init time: 29

Card type: SDHC

Manufacturer ID: 3
OEM ID: SD
Product: SB32G
Version: 8.0
Serial number: 1159489440
Manufacturing date: 6/2020

card size: 4290192384 (512 byte blocks)
partion,boot,type,start,length
1,0,C,8192,62325760
2,0,0,0,0
3,0,0,0,0
4,0,0,0,0
Read test starting. Please Wait.

Read 291 blocks
mills: 288

Read Failure
lbn: 62422119
nRead: 291/20000
SD error
errorCode: 10
errorData: 8

type any character to start
```

Note that the card size is improbably large.

The problem is a missing cast in the size() method.

```
} else if (csd.v2.csd_ver == 1) {
- uint32_t c_size = ((uint32_t)csd.v2.c_size_high << 16) |
- (csd.v2.c_size_mid << 8) | csd.v2.c_size_low;
+ uint32_t c_size = ((uint32_t)csd.v2.c_size_high) << 16 |
+ ((uint32_t)csd.v2.c_size_mid) << 8 | csd.v2.c_size_low;
return (c_size + 1) << 10;
```

Start at the size() method and inspect the SDHC card-size calculation shown in the issue. Run the SdReadTest example with a 32GB or larger SD card; done means the reported card size is plausible and the read test no longer fails.

Written by the indexing model from the issue text.