Avoid selecting multiple stats for progress report

app/src/main/java/net/pokeranalytics/android/calculus/Calculator.kt

@@ -107,6 +107,15 @@ class Calculator {
 						else -> false
 					}
 				}
+
+			val multipleStatSelection: Boolean
+				get() {
+					return when (this) {
+						PROGRESS -> false
+						else -> true
+					}
+				}
+
 		}
 
 		/**

app/src/main/java/net/pokeranalytics/android/ui/fragment/ReportCreationFragment.kt

@@ -259,12 +259,22 @@ class Assistant {
 				this.nextStep()
 			}
 			Step.STAT -> {
+
 				val stat = this.dataSource[position] as Stat
-				if (this.stats.contains(stat)) {
-					this.stats.remove(stat)
-				} else {
-					this.stats.add(stat)
+				when (this.display.multipleStatSelection) {
+					true -> {
+						if (this.stats.contains(stat)) {
+							this.stats.remove(stat)
+						} else {
+							this.stats.add(stat)
+						}
+					}
+					false -> {
+						this.stats.clear()
+						this.stats.add(stat)
+					}
 				}
+
 			}
 			Step.COMPARATOR -> {
 				val item = this.dataSource[position]