fix uriFromFile on windows

protocol/source/served/lsp/uri.d

@@ -14,17 +14,15 @@ private void assertEquals(T)(T a, T b)
 
 DocumentUri uriFromFile(scope const(char)[] file)
 {
+	import std.ascii : isUpper, toLower;
 	import std.uri : encodeComponent;
 
 	if ((!isAbsolute(file) && !file.startsWith("/"))
 		|| !file.length)
 		throw new Exception(text("Tried to pass relative path '", file, "' to uriFromFile"));
-	file = file.buildNormalizedPath();
-	version(Windows)
-	{
-		file = file.replace("\\", "/");
-		file = driveName(file).toLower() ~ stripDrive(file);
-	}
+	file = file.buildNormalizedPath().replace("\\", "/");
+	if (file.length >= 2 && file[0].isUpper && file[1] == ':')
+		file = file[0].toLower ~ file[1 .. $];
 	assert(file.length);
 	if (file.ptr[0] != '/')
 		file = '/' ~ file; // always triple slash at start but never quad slash