Make some fields internal

Author: rfc2822

lib/src/main/kotlin/at/bitfire/synctools/icalendar/validation/FixInvalidDayOffsetPreprocessor.kt

@@ -15,7 +15,7 @@ import androidx.annotation.VisibleForTesting
 class FixInvalidDayOffsetPreprocessor : StreamPreprocessor {
 
     @VisibleForTesting
-    val regexpForProblem = Regex(
+    internal val regexpForProblem = Regex(
         // Examples:
         // TRIGGER:-P2DT
         // TRIGGER:-PT2D

lib/src/main/kotlin/at/bitfire/synctools/icalendar/validation/FixInvalidUtcOffsetPreprocessor.kt

@@ -23,7 +23,7 @@ class FixInvalidUtcOffsetPreprocessor: StreamPreprocessor {
         get() = Logger.getLogger(javaClass.name)
 
     @VisibleForTesting
-    val regexpForProblem = Regex("^(TZOFFSET(FROM|TO):[+\\-]?)((18|19|[2-6]\\d)\\d\\d)$",
+    internal val regexpForProblem = Regex("^(TZOFFSET(FROM|TO):[+\\-]?)((18|19|[2-6]\\d)\\d\\d)$",
         setOf(RegexOption.MULTILINE, RegexOption.IGNORE_CASE))
 
     override fun repairLine(line: String) =