ToCamelCase() when kLowerCamel now converts first char to lower. (#7838)

ToCamelCase(input, true) converts first char to upper case, but
ToCamelCase(input, false) keeps the case of the first char. We are
changing its behavior to force a lower case.

Co-authored-by: Derek Bailey <derekbailey@google.com>

tests/MyGame/Example/Any.kt

@@ -9,7 +9,7 @@ class Any_ private constructor() {
         const val NONE: UByte = 0u
         const val Monster: UByte = 1u
         const val TestSimpleTableWithEnum: UByte = 2u
-        const val MyGameExample2Monster: UByte = 3u
+        const val MyGame_Example2_Monster: UByte = 3u
         val names : Array<String> = arrayOf("NONE", "Monster", "TestSimpleTableWithEnum", "MyGame_Example2_Monster")
         fun name(e: Int) : String = names[e]
     }