Commit 304bed2

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Fix the issue when monochome colorspace cause the WebP encoding failed

Just translate into RGBA first, don't need extra code to re-implements monochrome WebP encoding

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Original file line number	Diff line number	Diff line change
`@@ -885,6 +885,12 @@ - (nullable NSData *)sd_encodedWebpDataWithImage:(nullable CGImageRef)imageRef`
`885`	`885`	uint8_t *rgba = NULL; // RGBA Buffer managed by CFData, don't call `free` on it, instead call `CFRelease` on `dataRef`
`886`	`886`	`// We must prefer the input CGImage's color space, which may contains ICC profile`
`887`	`887`	`CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);`
	`888`	`+ // We only supports RGB colorspace, filter the un-supported one (like Monochrome, CMYK, etc)`
	`889`	`+ if (CGColorSpaceGetModel(colorSpace) != kCGColorSpaceModelRGB) {`
	`890`	`+ // Ignore and convert, we don't know how to encode this colorspace directlly to WebP`
	`891`	`+ // This may cause little visible difference because of colorpsace conversion`
	`892`	`+ colorSpace = NULL;`
	`893`	`+ }`
`888`	`894`	`if (!colorSpace) {`
`889`	`895`	`colorSpace = [SDImageCoderHelper colorSpaceGetDeviceRGB];`
`890`	`896`	`}`

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