ScannerIntegrationFunTest: Use Instant.EPOCH as start and end time

The test does cover the values used for these times. So, use
`Instant.EPOCH` for making the value deterministic, for aligning with
other "empty" default values. While at it also inline the variable to
simplify an upcoming change.

Signed-off-by: Frank Viernau <frank_viernau@epam.com>

scanner/src/funTest/kotlin/scanners/ScannerIntegrationFunTest.kt

@@ -97,8 +97,6 @@ class ScannerIntegrationFunTest : StringSpec() {
         override val criteria: ScannerCriteria = ScannerCriteria.forDetails(details)
 
         override fun scanPath(path: File, context: ScanContext): ScanSummary {
-            val time = Instant.now()
-
             val licenseFindings = path.listFiles().orEmpty().mapTo(sortedSetOf()) { file ->
                 LicenseFinding(
                     license = SpdxConstants.NONE,
@@ -107,8 +105,8 @@ class ScannerIntegrationFunTest : StringSpec() {
             }
 
             return ScanSummary(
-                startTime = time,
-                endTime = time,
+                startTime = Instant.EPOCH,
+                endTime = Instant.EPOCH,
                 packageVerificationCode = "",
                 licenseFindings = licenseFindings,
                 copyrightFindings = sortedSetOf(),