Revert "Release: Thunderbird Beta 18.0b2"

This reverts commit a8cae1c.

Author: coreycb

app-metadata/net.thunderbird.android.beta/en-US/changelogs/47.txt

@@ -14,7 +14,7 @@ android {
         applicationId = "net.thunderbird.android"
         testApplicationId = "net.thunderbird.android.tests"
 
-        versionCode = 47
+        versionCode = 46
         versionName = "18.0"
 
         buildConfigField("String", "CLIENT_INFO_APP_NAME", "\"Thunderbird for Android\"")
@@ -110,7 +110,7 @@ android {
             signingConfig = signingConfigs.getByType(SigningType.TB_BETA)
 
             applicationIdSuffix = ".beta"
-            versionNameSuffix = "b2"
+            versionNameSuffix = "b1"
 
             isMinifyEnabled = !isCI
             isShrinkResources = !isCI

app-thunderbird/build.gradle.kts

@@ -1,8 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <?xml-stylesheet type="text/xsl" href="changelog_style.xsl"?>
 <changelog>
-    <release version="18.0b2" versioncode="47" date="2026-03-18">
-    </release>
     <release version="18.0b1" versioncode="46" date="2026-03-16">
         <change>New: Add support for PNG avatars</change>
         <change>New: Add setting to display ISO date and time in message list</change>